also_reported listlengths 1 8 ⌀ | cas_number stringlengths 5 46 ⌀ | disagreements listlengths 0 2 ⌀ | id stringlengths 3 80 | pel_mgm3 stringlengths 1 11 ⌀ | pel_ppm stringclasses 46
values | source stringlengths 39 79 | source_quote stringlengths 19 139 | substance stringlengths 3 110 | url stringlengths 58 135 | verified_fields listlengths 2 8 | rel_statement stringclasses 20
values | rel_mgm3 stringclasses 81
values | rel_ppm stringclasses 37
values | ceiling_notation stringclasses 2
values | stel_mgm3 stringclasses 31
values | stel_ppm stringclasses 18
values | ceiling stringclasses 4
values |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
[
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "122394 | | Diphenylamine; N-phenylaniline | -- | 10",
"value": "10"
}
] | 122-39-4 | [] | diphenylamine | null | null | https://www.cdc.gov/niosh/npg/npgd0240.html | NIOSH REL TWA 10 mg/m3 | Diphenylamine | https://referencesource.org/workplace-exposure-limits/diphenylamine/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 10 | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0242.html",
"source_quote": "NIOSH REL TWA 50 ppm (235 mg/m3)",
"value": "TWA 50"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/... | 123193 | [] | dipropyl-ketone | 235 | 50 | https://www.dir.ca.gov/title8/5155.html | 123193 | | Dipropyl ketone | 50 | 235 | Dipropyl ketone | https://referencesource.org/workplace-exposure-limits/dipropyl-ketone/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_ppm",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "34590948 | S | Dipropylene glycol methyl ether | 100 | 600 | | 150 | 900",
"value": "150"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"sourc... | 34590-94-8 | [] | dipropylene-glycol-methyl-ether | 600 | 100 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Dipropylene glycol methyl ether | 34590-94-8 | 100 | 600 | X | | Dipropylene glycol methyl ether | https://referencesource.org/workplace-exposure-limits/dipropylene-glycol-methyl-ether/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0243.html",
"source_quote": "NIOSH REL TWA 0.5 mg/m3",
"value": "TWA 0.5"
}
] | 85007 | [] | diquat-1-1-ethylene-2-2-dipyridinium-dibromide | null | null | https://www.dir.ca.gov/title8/5155.html | 85007 | | Diquat; 1,1'-ethylene-2,2'-dipyridinium dibromide | -- | Diquat; 1,1'-ethylene-2,2'-dipyridinium dibromide | https://referencesource.org/workplace-exposure-limits/diquat-1-1-ethylene-2-2-dipyridinium-dibromide/ | [
"cas_number",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0244.html",
"source_quote": "NIOSH REL TWA 2 mg/m3 [Precautions should be taken to avoid concurrent exposure to ethylene dibromide.]",
"value": "TWA 2"
}
] | 97778 | [] | disulfiram | 2 | null | https://www.dir.ca.gov/title8/5155.html | 97778 | | Disulfiram | -- | 2 | Disulfiram | https://referencesource.org/workplace-exposure-limits/disulfiram/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "298044 | S | Disulfoton; o,o-diethyl S-2-(ethylthio)ethyl phosphorodithioate | -- | 0.1",
"value": "0.1"
}
] | 298-04-4 | [] | disulfoton | null | null | https://www.cdc.gov/niosh/npg/npgd0245.html | NIOSH REL TWA 0.1 mg/m3 [skin] | Disulfoton | https://referencesource.org/workplace-exposure-limits/disulfoton/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 0.1 | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0247.html",
"source_quote": "NIOSH REL TWA 10 mg/m3",
"value": "TWA 10"
}
] | 330541 | [] | diuron | 10 | null | https://www.dir.ca.gov/title8/5155.html | 330541 | | Diuron | -- | 10 | Diuron | https://referencesource.org/workplace-exposure-limits/diuron/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0248.html",
"source_quote": "NIOSH REL TWA 10 ppm (50 mg/m3)",
"value": "TWA 10"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/n... | 1321740 | [] | divinyl-benzene | 50 | 10 | https://www.dir.ca.gov/title8/5155.html | 1321740 | | Divinyl benzene | 10 | 50 | Divinyl benzene | https://referencesource.org/workplace-exposure-limits/divinyl-benzene/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 12415-34-8 | [] | emery | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Emery | 12415-34-8 | - | - | - | | Emery | https://referencesource.org/workplace-exposure-limits/emery/ | [
"cas_number",
"substance"
] | null | null | null | null | null | null | null |
null | 1302-74-5 (corundum) | null | emery-2 | null | null | https://www.cdc.gov/niosh/npg/npgd0250.html | NIOSH REL See Appendix D | Emery | https://referencesource.org/workplace-exposure-limits/emery-2/ | [
"cas_number",
"rel_statement",
"substance"
] | See Appendix D | null | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "115297 | S | Endosulfan; 6,7,8,9,10,10-hexachloro-1,5,5a,6,9,9a-hexahydro-6,9-methano-2,4, 3-benzodioxathiepin-3-oxide | -- | 0.1",
"value": "0.1"
}
] | 115-29-7 | [] | endosulfan | null | null | https://www.cdc.gov/niosh/npg/npgd0251.html | NIOSH REL TWA 0.1 mg/m3 [skin] | Endosulfan | https://referencesource.org/workplace-exposure-limits/endosulfan/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 0.1 | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0252.html",
"source_quote": "NIOSH REL TWA 0.1 mg/m3 [skin]",
"value": "TWA 0.1"
}
] | 72-20-8 | [] | endrin | 0.1 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Endrin | 72-20-8 | - | 0.1 | X | | Endrin | https://referencesource.org/workplace-exposure-limits/endrin/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0253.html",
"source_quote": "NIOSH REL C 2 ppm (15.1 mg/m3) [60-minute]",
"value": "C 2"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/nio... | 13838169 | [] | enflurane | 15 | 2 | https://www.dir.ca.gov/title8/5155.html | 13838169 | | Enflurane | 2 | 15 | Enflurane | https://referencesource.org/workplace-exposure-limits/enflurane/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_statement",
"source": "https://www.cdc.gov/niosh/npg/npgd0254.html",
"source_quote": "NIOSH REL Ca See Appendix A",
"value": "Ca See Appendix A"
}
] | 106-89-8 | [
{
"field": "pel_ppm",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Epichlorohydrin | 106-89-8 | 5 | 19 | X |",
"value": "5"
},
{
"as_of":... | epichlorohydrin | 19 | 5 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Epichlorohydrin | 106-89-8 | 5 | 19 | X | | Epichlorohydrin | https://referencesource.org/workplace-exposure-limits/epichlorohydrin/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0255.html",
"source_quote": "NIOSH REL TWA 0.5 mg/m3 [skin]",
"value": "TWA 0.5"
}
] | 2104-64-5 | [
{
"field": "pel_mgm3",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "EPN | 2104-64-5 | - | 0.5 | X |",
"value": "0.5"
},
{
"as_of": "2026-... | epn | 0.5 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | EPN | 2104-64-5 | - | 0.5 | X | | EPN | https://referencesource.org/workplace-exposure-limits/epn/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 74840 | null | ethane | null | null | https://www.dir.ca.gov/title8/5155.html | 74840 | | Ethane | (h) | -- | Ethane | https://referencesource.org/workplace-exposure-limits/ethane/ | [
"cas_number",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0256.html",
"source_quote": "NIOSH REL TWA 3 ppm (8 mg/m3) ST 6 ppm (15 mg/m3)",
"value": "TWA 3"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cd... | 141-43-5 | [
{
"field": "pel_mgm3",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Ethanolamine | 141-43-5 | 3 | 6 | - |",
"value": "6"
},
{
"as_of": "2... | ethanolamine | 6 | 3 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Ethanolamine | 141-43-5 | 3 | 6 | - | | Ethanolamine | https://referencesource.org/workplace-exposure-limits/ethanolamine/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0257.html",
"source_quote": "NIOSH REL TWA 0.4 mg/m3 [skin]",
"value": "TWA 0.4"
}
] | 563122 | [] | ethion | 0.4 | null | https://www.dir.ca.gov/title8/5155.html | 563122 | S | Ethion | -- | 0.4 | Ethion | https://referencesource.org/workplace-exposure-limits/ethion/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0260.html",
"source_quote": "NIOSH REL TWA 400 ppm (1400 mg/m3)",
"value": "TWA 400"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/n... | 141-78-6 | [] | ethyl-acetate | 1400 | 400 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Ethyl acetate | 141-78-6 | 400 | 1400 | - | | Ethyl acetate | https://referencesource.org/workplace-exposure-limits/ethyl-acetate/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_ppm",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "140885 | S | Ethyl acrylate | 5 | 20 | | 25 | 100",
"value": "25"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "https://www.dir.ca.... | 140-88-5 | [
{
"field": "pel_ppm",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Ethyl acrylate | 140-88-5 | 25 | 100 | X |",
"value": "25"
},
{
"as_of... | ethyl-acrylate | 100 | 25 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Ethyl acrylate | 140-88-5 | 25 | 100 | X | | Ethyl acrylate | https://referencesource.org/workplace-exposure-limits/ethyl-acrylate/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_ppm",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Ethyl alcohol (Ethanol) | 64-17-5 | 1000 | 1900 | - |",
"value": "1000"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "p... | 64-17-5 | [] | ethyl-alcohol | null | null | https://www.cdc.gov/niosh/npg/npgd0262.html | NIOSH REL TWA 1000 ppm (1900 mg/m3) | Ethyl alcohol | https://referencesource.org/workplace-exposure-limits/ethyl-alcohol/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 1900 | TWA 1000 | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0264.html",
"source_quote": "NIOSH REL TWA 100 ppm (435 mg/m3) ST 125 ppm (545 mg/m3)",
"value": "TWA 100"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https... | 100-41-4 | [
{
"field": "pel_ppm",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Ethyl benzene | 100-41-4 | 100 | 435 | - |",
"value": "100"
},
{
"as_o... | ethyl-benzene | 435 | 100 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Ethyl benzene | 100-41-4 | 100 | 435 | - | | Ethyl benzene | https://referencesource.org/workplace-exposure-limits/ethyl-benzene/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_statement",
"source": "https://www.cdc.gov/niosh/npg/npgd0265.html",
"source_quote": "NIOSH REL See Appendix D",
"value": "See Appendix D"
}
] | 74-96-4 | [
{
"field": "pel_ppm",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Ethyl bromide | 74-96-4 | 200 | 890 | - |",
"value": "200"
},
{
"as_of... | ethyl-bromide | 890 | 200 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Ethyl bromide | 74-96-4 | 200 | 890 | - | | Ethyl bromide | https://referencesource.org/workplace-exposure-limits/ethyl-bromide/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_ppm",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Ethyl butyl ketone (3-Heptanone) | 106-35-4 | 50 | 230 | - |",
"value": "50"
},
{
"as_of": "2026-08-05T00:00:00",
"field... | 106-35-4 | [] | ethyl-butyl-ketone | null | null | https://www.cdc.gov/niosh/npg/npgd0266.html | NIOSH REL TWA 50 ppm (230 mg/m3) | Ethyl butyl ketone | https://referencesource.org/workplace-exposure-limits/ethyl-butyl-ketone/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 230 | TWA 50 | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_statement",
"source": "https://www.cdc.gov/niosh/npg/npgd0267.html",
"source_quote": "NIOSH REL Handle with caution in the workplace. See Appendix C (Chloroethanes)",
"value": "Handle with caution in the workplace. See Appendix C (Chloroethanes)"
... | 75-00-3 | [
{
"field": "pel_ppm",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Ethyl chloride | 75-00-3 | 1000 | 2600 | - |",
"value": "1000"
},
{
"a... | ethyl-chloride | 2600 | 1000 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Ethyl chloride | 75-00-3 | 1000 | 2600 | - | | Ethyl chloride | https://referencesource.org/workplace-exposure-limits/ethyl-chloride/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 7085850 | null | ethyl-cyanoacrylate | 1.02 | 0.2 | https://www.dir.ca.gov/title8/5155.html | 7085850 | | Ethyl cyanoacrylate | 0.2 | 1.02 | Ethyl cyanoacrylate | https://referencesource.org/workplace-exposure-limits/ethyl-cyanoacrylate/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_ppm",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "60297 | | Ethyl ether | 400 | 1,200 | | 500 | 1500",
"value": "500"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "https://www.dir.c... | 60-29-7 | [] | ethyl-ether | 1200 | 400 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Ethyl ether | 60-29-7 | 400 | 1200 | - | | Ethyl ether | https://referencesource.org/workplace-exposure-limits/ethyl-ether/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0278.html",
"source_quote": "NIOSH REL TWA 100 ppm (300 mg/m3)",
"value": "TWA 100"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/np... | 109-94-4 | [] | ethyl-formate | 300 | 100 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Ethyl formate | 109-94-4 | 100 | 300 | - | | Ethyl formate | https://referencesource.org/workplace-exposure-limits/ethyl-formate/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0280.html",
"source_quote": "NIOSH REL C 0.5 ppm (1.3 mg/m3) [15-minute]",
"value": "C 0.5"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/... | 75-08-1 | [
{
"field": "pel_ppm",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Ethyl mercaptan | 75-08-1 | (C)10 | (C)25 | - |",
"value": "(C)10"
},
{
... | ethyl-mercaptan | (C)25 | (C)10 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Ethyl mercaptan | 75-08-1 | (C)10 | (C)25 | - | | Ethyl mercaptan | https://referencesource.org/workplace-exposure-limits/ethyl-mercaptan/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0282.html",
"source_quote": "NIOSH REL TWA 10 ppm (85 mg/m3)",
"value": "TWA 10"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/n... | 78-10-4 | [
{
"field": "pel_ppm",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Ethyl silicate | 78-10-4 | 100 | 850 | - |",
"value": "100"
},
{
"as_o... | ethyl-silicate | 850 | 100 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Ethyl silicate | 78-10-4 | 100 | 850 | - | | Ethyl silicate | https://referencesource.org/workplace-exposure-limits/ethyl-silicate/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 637923 | null | ethyl-tert-butyl-ether | 21 | 5 | https://www.dir.ca.gov/title8/5155.html | 637923 | | Ethyl tert-butyl ether | 5 | 21 | Ethyl tert-butyl ether | https://referencesource.org/workplace-exposure-limits/ethyl-tert-butyl-ether/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-28T00:00:00",
"field": "ceiling_notation",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "75047 | S | Ethylamine | 5 | 9.2 | C",
"value": "the values given in the PEL columns are ceiling values"
},
{
"as_of": "2026-09-08T00:00:00",
"field": ... | 75-04-7 | [
{
"field": "pel_ppm",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Ethylamine | 75-04-7 | 10 | 18 | - |",
"value": "10"
},
{
"as_of": "20... | ethylamine | 18 | 10 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Ethylamine | 75-04-7 | 10 | 18 | - | | Ethylamine | https://referencesource.org/workplace-exposure-limits/ethylamine/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 74851 | null | ethylene | null | null | https://www.dir.ca.gov/title8/5155.html | 74851 | | Ethylene | (h) | -- | Ethylene | https://referencesource.org/workplace-exposure-limits/ethylene/ | [
"cas_number",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0268.html",
"source_quote": "NIOSH REL C 1 ppm (3 mg/m3) [skin]",
"value": "C 1"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/n... | 107-07-3 | [
{
"field": "pel_ppm",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Ethylene chlorohydrin | 107-07-3 | 5 | 16 | X |",
"value": "5"
},
{
"a... | ethylene-chlorohydrin | 16 | 5 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Ethylene chlorohydrin | 107-07-3 | 5 | 16 | X | | Ethylene chlorohydrin | https://referencesource.org/workplace-exposure-limits/ethylene-chlorohydrin/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-28T00:00:00",
"field": "pel_ppm",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "106934 | S | Ethylene dibromide; 1,2-dibromoethane, see Section 5219 | 0.13 | 1 | C",
"value": "0.13"
},
{
"as_of": "2026-09-28T00:00:00",
"field": "pel_mgm3",
... | 106-93-4 | [] | ethylene-dibromide | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Ethylene dibromide | 106-93-4 | - | (2) | - | | Ethylene dibromide | https://referencesource.org/workplace-exposure-limits/ethylene-dibromide/ | [
"cas_number",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-28T00:00:00",
"field": "pel_ppm",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "107062 | | Ethylene dichloride; 1,2-dichloroethane | 1 | 4 | 200 ppm | 2 | 8",
"value": "1"
},
{
"as_of": "2026-09-28T00:00:00",
"field": "pel_mgm3",
"sourc... | 107-06-2 | [] | ethylene-dichloride | null | null | https://www.cdc.gov/niosh/npg/npgd0271.html | NIOSH REL Ca TWA 1 ppm (4 mg/m3) ST 2 ppm (8 mg/m3) | Ethylene dichloride | https://referencesource.org/workplace-exposure-limits/ethylene-dichloride/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 4 | TWA 1 | null | null | null | null |
[
{
"as_of": "2026-09-28T00:00:00",
"field": "pel_ppm",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "107211 | | Ethylene glycol (vapor) | 40 | 100 | C",
"value": "40"
},
{
"as_of": "2026-09-28T00:00:00",
"field": "pel_mgm3",
"source": "https://www.dir.ca.go... | 107-21-1 | [] | ethylene-glycol | null | null | https://www.cdc.gov/niosh/npg/npgd0272.html | NIOSH REL See Appendix D | Ethylene glycol | https://referencesource.org/workplace-exposure-limits/ethylene-glycol/ | [
"cas_number",
"rel_statement",
"substance"
] | See Appendix D | null | null | null | null | null | null |
null | 629141 | null | ethylene-glycol-diethyl-ether-1-2-diethoxyethane | 24 | 5 | https://www.dir.ca.gov/title8/5155.html | 629141 | S | Ethylene glycol diethyl ether, 1,2-diethoxyethane | 5 | 24 | Ethylene glycol diethyl ether, 1,2-diethoxyethane | https://referencesource.org/workplace-exposure-limits/ethylene-glycol-diethyl-ether-1-2-diethoxyethane/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 110714 | null | ethylene-glycol-dimethyl-ether-1-2-dimethoxyethane-glyme | 3.7 | 1 | https://www.dir.ca.gov/title8/5155.html | 110714 | S | Ethylene glycol dimethyl ether, 1,2-dimethoxyethane, Glyme | 1 | 3.7 | | 5 | 18 | Ethylene glycol dimethyl ether, 1,2-dimethoxyethane, Glyme | https://referencesource.org/workplace-exposure-limits/ethylene-glycol-dimethyl-ether-1-2-dimethoxyethane-glyme/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"stel_mgm3",
"stel_ppm",
"substance"
] | null | null | null | null | 18 | 5 | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "628966 | S | Ethylene glycol dinitrate | | (k) | | -- | 0.1",
"value": "0.1"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://... | 628-96-6 | [] | ethylene-glycol-dinitrate | (C)1 | (C)0.2 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Ethylene glycol dinitrate | 628-96-6 | (C)0.2 | (C)1 | X | | Ethylene glycol dinitrate | https://referencesource.org/workplace-exposure-limits/ethylene-glycol-dinitrate/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_ppm",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "75218 | | Ethylene oxide; see Section 5220 | 1 | 2 | | 5",
"value": "1"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",
"source": "https://www.dir... | 75-21-8 | [] | ethylene-oxide | null | null | https://www.cdc.gov/niosh/npg/npgd0275.html | NIOSH REL Ca TWA <0.1 ppm (0.18 mg/m3) C 5 ppm (9 mg/m3) [10-min/day] | Ethylene oxide | https://referencesource.org/workplace-exposure-limits/ethylene-oxide/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 9 | C 5 | null | null | null | null |
null | 96-45-7 | null | ethylene-thiourea | null | null | https://www.cdc.gov/niosh/npg/npgd0276.html | NIOSH REL Ca Use encapsulated form. See Appendix A | Ethylene thiourea | https://referencesource.org/workplace-exposure-limits/ethylene-thiourea/ | [
"cas_number",
"rel_statement",
"substance"
] | Ca Use encapsulated form. See Appendix A | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0269.html",
"source_quote": "NIOSH REL TWA 10 ppm (25 mg/m3)",
"value": "TWA 10"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/n... | 107-15-3 | [] | ethylenediamine | 25 | 10 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Ethylenediamine | 107-15-3 | 10 | 25 | - | | Ethylenediamine | https://referencesource.org/workplace-exposure-limits/ethylenediamine/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_ppm",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "151564 | S | Ethyleneimine; see also Section 5209 | 0.5 | 1",
"value": "0.5"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",
"source": "https://ww... | 151-56-4 | [] | ethyleneimine | null | null | https://www.cdc.gov/niosh/npg/npgd0274.html | NIOSH REL Ca See Appendix A | Ethyleneimine | https://referencesource.org/workplace-exposure-limits/ethyleneimine/ | [
"cas_number",
"rel_statement",
"substance"
] | Ca See Appendix A | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0279.html",
"source_quote": "NIOSH REL C 5 ppm (25 mg/m3)",
"value": "C 5"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd027... | 16219753 | [] | ethylidene-norbornene | 25 | 5 | https://www.dir.ca.gov/title8/5155.html | 16219753 | | Ethylidene norbornene | 5 | 25 | C | Ethylidene norbornene | https://referencesource.org/workplace-exposure-limits/ethylidene-norbornene/ | [
"cas_number",
"ceiling_notation",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | the values given in the PEL columns are ceiling values | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0283.html",
"source_quote": "NIOSH REL TWA 0.1 mg/m3 [skin]",
"value": "TWA 0.1"
}
] | 22224926 | [] | fenamiphos | 0.1 | null | https://www.dir.ca.gov/title8/5155.html | 22224926 | S | Fenamiphos | | 0.1 | Fenamiphos | https://referencesource.org/workplace-exposure-limits/fenamiphos/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0284.html",
"source_quote": "NIOSH REL TWA 0.1 mg/m3",
"value": "TWA 0.1"
}
] | 115902 | [] | fensulfothion | 0.1 | null | https://www.dir.ca.gov/title8/5155.html | 115902 | | Fensulfothion | -- | 0.1 | Fensulfothion | https://referencesource.org/workplace-exposure-limits/fensulfothion/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_statement",
"source": "https://www.cdc.gov/niosh/npg/npgd0285.html",
"source_quote": "NIOSH REL See Appendix D",
"value": "See Appendix D"
}
] | 55389 | [] | fenthion | 0.2 | null | https://www.dir.ca.gov/title8/5155.html | 55389 | S | Fenthion | -- | 0.2 | Fenthion | https://referencesource.org/workplace-exposure-limits/fenthion/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0286.html",
"source_quote": "NIOSH REL TWA 10 mg/m3",
"value": "TWA 10"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",
"source": "https://www.dir.ca.gov/title8/5155.html... | 14484-64-1 | [] | ferbam | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Ferbam | 14484-64-1 | - | - | - | | Ferbam | https://referencesource.org/workplace-exposure-limits/ferbam/ | [
"cas_number",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "12604589 | | Ferrovanadium dust | -- | 1 | | -- | 3",
"value": "3"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.go... | 12604-58-9 | [] | ferrovanadium-dust | 1 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Ferrovanadium dust | 12604-58-9 | - | 1 | - | | Ferrovanadium dust | https://referencesource.org/workplace-exposure-limits/ferrovanadium-dust/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | null | null | flour-dust | 0.5(s) | null | https://www.dir.ca.gov/title8/5155.html | Flour dust | | 0.5(s) | Flour dust | https://referencesource.org/workplace-exposure-limits/flour-dust/ | [
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | null | null | fluorides-as-f | 2.5 | null | https://www.dir.ca.gov/title8/5155.html | Fluorides, as F | -- | 2.5 | Fluorides, as F | https://referencesource.org/workplace-exposure-limits/fluorides-as-f/ | [
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0289.html",
"source_quote": "NIOSH REL TWA 0.1 ppm (0.2 mg/m3)",
"value": "TWA 0.1"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/np... | 7782-41-4 | [] | fluorine | 0.2 | 0.1 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Fluorine | 7782-41-4 | 0.1 | 0.2 | - | | Fluorine | https://referencesource.org/workplace-exposure-limits/fluorine/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_ppm",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Fluorotrichloromethane (Trichlorofluoromethane) | 75-69-4 | 1000 | 5600 | - |",
"value": "1000"
},
{
"as_of": "2026-08-05T00... | 75-69-4 | [] | fluorotrichloromethane | null | null | https://www.cdc.gov/niosh/npg/npgd0290.html | NIOSH REL C 1000 ppm (5600 mg/m3) | Fluorotrichloromethane | https://referencesource.org/workplace-exposure-limits/fluorotrichloromethane/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 5600 | C 1000 | null | null | null | null |
null | 406-90-6 | null | fluoroxene | null | null | https://www.cdc.gov/niosh/npg/npgd0291.html | NIOSH REL C 2 ppm (10.3 mg/m3) [60-minute] | Fluoroxene | https://referencesource.org/workplace-exposure-limits/fluoroxene/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 10.3 | C 2 | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0292.html",
"source_quote": "NIOSH REL TWA 0.1 mg/m3 [skin]",
"value": "TWA 0.1"
}
] | 944229 | [] | fonofos | 0.1 | null | https://www.dir.ca.gov/title8/5155.html | 944229 | S | Fonofos | -- | 0.1 | Fonofos | https://referencesource.org/workplace-exposure-limits/fonofos/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_ppm",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "50000 | | Formaldehyde, see Section 5217 | 0.75 | -- | | 2 | --",
"value": "0.75"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_ppm",
"source": "https... | 50-00-0 | [] | formaldehyde | null | null | https://www.cdc.gov/niosh/npg/npgd0293.html | NIOSH REL Ca TWA 0.016 ppm C 0.1 ppm [15-minute] | Formaldehyde | https://referencesource.org/workplace-exposure-limits/formaldehyde/ | [
"cas_number",
"rel_ppm",
"substance"
] | null | null | TWA 0.016 | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0295.html",
"source_quote": "NIOSH REL TWA 10 ppm (15 mg/m3) [skin]",
"value": "TWA 10"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/nios... | 75127 | [] | formamide | 18 | 10 | https://www.dir.ca.gov/title8/5155.html | 75127 | S | Formamide | 10 | 18 | Formamide | https://referencesource.org/workplace-exposure-limits/formamide/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_ppm",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "64186 | | Formic acid | 5 | 9 | | 10 | 19",
"value": "10"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "https://www.dir.ca.gov/titl... | 64-18-6 | [] | formic-acid | 9 | 5 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Formic acid | 64-18-6 | 5 | 9 | - | | Formic acid | https://referencesource.org/workplace-exposure-limits/formic-acid/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_statement",
"source": "https://www.cdc.gov/niosh/npg/npgd0297.html",
"source_quote": "NIOSH REL See Appendix D",
"value": "See Appendix D"
}
] | 98-01-1 | [
{
"field": "pel_ppm",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Furfural | 98-01-1 | 5 | 20 | X |",
"value": "5"
},
{
"as_of": "2026-0... | furfural | 20 | 5 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Furfural | 98-01-1 | 5 | 20 | X | | Furfural | https://referencesource.org/workplace-exposure-limits/furfural/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_ppm",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "98000 | S | Furfuryl alcohol | 10 | 40 | | 15 | 60",
"value": "15"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "https://www.dir.ca... | 98-00-0 | [
{
"field": "pel_ppm",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Furfuryl alcohol | 98-00-0 | 50 | 200 | - |",
"value": "50"
},
{
"as_o... | furfuryl-alcohol | 200 | 50 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Furfuryl alcohol | 98-00-0 | 50 | 200 | - | | Furfuryl alcohol | https://referencesource.org/workplace-exposure-limits/furfuryl-alcohol/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_statement",
"source": "https://www.cdc.gov/niosh/npg/npgd0299.html",
"source_quote": "NIOSH REL Ca See Appendix A",
"value": "Ca See Appendix A"
}
] | 8006619 | [] | gasoline | 900 | 300 | https://www.dir.ca.gov/title8/5155.html | 8006619 | | Gasoline | 300 | 900 | | 500 | 1500 | Gasoline | https://referencesource.org/workplace-exposure-limits/gasoline/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"stel_mgm3",
"stel_ppm",
"substance"
] | null | null | null | null | 1500 | 500 | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0300.html",
"source_quote": "NIOSH REL TWA 0.2 ppm (0.6 mg/m3)",
"value": "TWA 0.2"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/np... | 7782652 | [] | germanium-tetrahydride | 0.6 | 0.2 | https://www.dir.ca.gov/title8/5155.html | 7782652 | | Germanium tetrahydride | 0.2 | 0.6 | Germanium tetrahydride | https://referencesource.org/workplace-exposure-limits/germanium-tetrahydride/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | null | null | glass-fibrous | null | 1.0 f/cc(q) | https://www.dir.ca.gov/title8/5155.html | Glass, fibrous | 1.0 f/cc(q) | Glass, fibrous | https://referencesource.org/workplace-exposure-limits/glass-fibrous/ | [
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-28T00:00:00",
"field": "pel_ppm",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "111308 | | Glutaraldehyde(t) | 0.05 | 0.2 | C",
"value": "0.05"
},
{
"as_of": "2026-09-28T00:00:00",
"field": "pel_mgm3",
"source": "https://www.dir.ca.gov/... | 111-30-8 | [] | glutaraldehyde | null | null | https://www.cdc.gov/niosh/npg/npgd0301.html | NIOSH REL C 0.2 ppm (0.8 mg/m3) | Glutaraldehyde | https://referencesource.org/workplace-exposure-limits/glutaraldehyde/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 0.8 | C 0.2 | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_statement",
"source": "https://www.cdc.gov/niosh/npg/npgd0302.html",
"source_quote": "NIOSH REL See Appendix D",
"value": "See Appendix D"
}
] | 56-81-5 | [] | glycerin-mist | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Glycerin (mist) | 56-81-5 | - | - | - | | Glycerin (mist) | https://referencesource.org/workplace-exposure-limits/glycerin-mist/ | [
"cas_number",
"substance"
] | null | null | null | null | null | null | null |
null | 123944 | null | glyceryl-stearate | 10 | null | https://www.dir.ca.gov/title8/5155.html | 123944 | | Glyceryl stearate | -- | 10 | Glyceryl stearate | https://referencesource.org/workplace-exposure-limits/glyceryl-stearate/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0303.html",
"source_quote": "NIOSH REL TWA 25 ppm (75 mg/m3)",
"value": "TWA 25"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/n... | 556-52-5 | [
{
"field": "pel_ppm",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Glycidol | 556-52-5 | 50 | 150 | - |",
"value": "50"
},
{
"as_of": "20... | glycidol | 150 | 50 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Glycidol | 556-52-5 | 50 | 150 | - | | Glycidol | https://referencesource.org/workplace-exposure-limits/glycidol/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 107-16-4 | null | glycolonitrile | null | null | https://www.cdc.gov/niosh/npg/npgd0304.html | NIOSH REL C 2 ppm (5 mg/m3) [15-minute] | Glycolonitrile | https://referencesource.org/workplace-exposure-limits/glycolonitrile/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 5 | C 2 | null | null | null | null |
null | 107222 | null | glyoxal-1-2-ethanedione | 0.1(s), (u) | null | https://www.dir.ca.gov/title8/5155.html | 107222 | | Glyoxal, 1,2-ethanedione | -- | 0.1(s), (u) | Glyoxal, 1,2-ethanedione | https://referencesource.org/workplace-exposure-limits/glyoxal-1-2-ethanedione/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | null | null | grain-dust-oat-wheat-barley | 10 | null | https://www.dir.ca.gov/title8/5155.html | Grain dust (oat, wheat, barley) | -- | 10 | Grain dust (oat, wheat, barley) | https://referencesource.org/workplace-exposure-limits/grain-dust-oat-wheat-barley/ | [
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "7782425 | | Graphite, natural respirable dust | | 2.5",
"value": "2.5"
}
] | 7782-42-5 | [] | graphite-natural | null | null | https://www.cdc.gov/niosh/npg/npgd0306.html | NIOSH REL TWA 2.5 mg/m3 (resp) | Graphite (natural) | https://referencesource.org/workplace-exposure-limits/graphite-natural/ | [
"cas_number",
"rel_statement",
"substance"
] | TWA 2.5 mg/m3 (resp) | null | null | null | null | null | null |
null | 7440-44-0 (synthetic) | null | graphite-synthetic | null | null | https://www.cdc.gov/niosh/npg/npgd0307.html | NIOSH REL See Appendix D | Graphite (synthetic) | https://referencesource.org/workplace-exposure-limits/graphite-synthetic/ | [
"cas_number",
"rel_statement",
"substance"
] | See Appendix D | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_statement",
"source": "https://www.cdc.gov/niosh/npg/npgd0308.html",
"source_quote": "NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)",
"value": "TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)"
}
] | 13397-24-5 | [] | gypsum | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Gypsum | 13397-24-5 | - | - | - | | Gypsum | https://referencesource.org/workplace-exposure-limits/gypsum/ | [
"cas_number",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0309.html",
"source_quote": "NIOSH REL TWA 0.5 mg/m3",
"value": "TWA 0.5"
}
] | 7440-58-6 | [] | hafnium | 0.5 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Hafnium | 7440-58-6 | - | 0.5 | - | | Hafnium | https://referencesource.org/workplace-exposure-limits/hafnium/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0310.html",
"source_quote": "NIOSH REL C 2 ppm (16.2 mg/m3) [60-minute]",
"value": "C 2"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/nio... | 151677 | [] | halothane | 16 | 2 | https://www.dir.ca.gov/title8/5155.html | 151677 | | Halothane | 2 | 16 | Halothane | https://referencesource.org/workplace-exposure-limits/halothane/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 7440597 | null | helium | null | null | https://www.dir.ca.gov/title8/5155.html | 7440597 | | Helium | (h) | -- | Helium | https://referencesource.org/workplace-exposure-limits/helium/ | [
"cas_number",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0311.html",
"source_quote": "NIOSH REL Ca TWA 0.5 mg/m3 [skin]",
"value": "TWA 0.5"
}
] | 76-44-8 | [
{
"field": "pel_mgm3",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Heptachlor | 76-44-8 | - | 0.5 | X |",
"value": "0.5"
},
{
"as_of": "... | heptachlor | 0.5 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Heptachlor | 76-44-8 | - | 0.5 | X | | Heptachlor | https://referencesource.org/workplace-exposure-limits/heptachlor/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_ppm",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "142825 | | n-Heptane | 400 | 1,600 | | 500 | 2000",
"value": "500"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "https://www.dir.ca... | 142-82-5 | [
{
"field": "pel_ppm",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Heptane (n-Heptane) | 142-82-5 | 500 | 2000 | - |",
"value": "500"
},
{
... | heptane-n-heptane | 2000 | 500 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Heptane (n-Heptane) | 142-82-5 | 500 | 2000 | - | | Heptane (n-Heptane) | https://referencesource.org/workplace-exposure-limits/heptane-n-heptane/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 118741 | null | hexachlorobenzene | 0.002 | null | https://www.dir.ca.gov/title8/5155.html | 118741 | S | Hexachlorobenzene | -- | 0.002 | Hexachlorobenzene | https://referencesource.org/workplace-exposure-limits/hexachlorobenzene/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0314.html",
"source_quote": "NIOSH REL Ca TWA 0.02 ppm (0.24 mg/m3) [skin]",
"value": "TWA 0.02"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc... | 87683 | [] | hexachlorobutadiene | 0.24 | 0.02 | https://www.dir.ca.gov/title8/5155.html | 87683 | S | Hexachlorobutadiene | 0.02 | 0.24 | Hexachlorobutadiene | https://referencesource.org/workplace-exposure-limits/hexachlorobutadiene/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0315.html",
"source_quote": "NIOSH REL TWA 0.01 ppm (0.1 mg/m3)",
"value": "TWA 0.01"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/... | 77474 | [] | hexachlorocyclopentadiene | 0.11 | 0.01 | https://www.dir.ca.gov/title8/5155.html | 77474 | | Hexachlorocyclopentadiene | 0.01 | 0.11 | Hexachlorocyclopentadiene | https://referencesource.org/workplace-exposure-limits/hexachlorocyclopentadiene/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0316.html",
"source_quote": "NIOSH REL Ca TWA 1 ppm (10 mg/m3) [skin]",
"value": "TWA 1"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/nio... | 67-72-1 | [] | hexachloroethane | 10 | 1 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Hexachloroethane | 67-72-1 | 1 | 10 | X | | Hexachloroethane | https://referencesource.org/workplace-exposure-limits/hexachloroethane/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0317.html",
"source_quote": "NIOSH REL TWA 0.2 mg/m3 [skin]",
"value": "TWA 0.2"
}
] | 1335-87-1 | [] | hexachloronaphthalene | 0.2 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Hexachloronaphthalene | 1335-87-1 | - | 0.2 | X | | Hexachloronaphthalene | https://referencesource.org/workplace-exposure-limits/hexachloronaphthalene/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_ppm",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "684162 | S | Hexafluoroacetone; 1,1,1,3,3,3-hexafluoro-2-propanone | 0.1 | 0.7",
"value": "0.1"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",
"s... | 684-16-2 | [] | hexafluoroacetone | null | null | https://www.cdc.gov/niosh/npg/npgd0319.html | NIOSH REL TWA 0.1 ppm (0.7 mg/m³) [skin] | Hexafluoroacetone | https://referencesource.org/workplace-exposure-limits/hexafluoroacetone/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 0.7 | TWA 0.1 | null | null | null | null |
null | 680-31-9 | null | hexamethyl-phosphoramide | null | null | https://www.cdc.gov/niosh/npg/npgd0321.html | NIOSH REL Ca See Appendix A | Hexamethyl phosphoramide | https://referencesource.org/workplace-exposure-limits/hexamethyl-phosphoramide/ | [
"cas_number",
"rel_statement",
"substance"
] | Ca See Appendix A | null | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_ppm",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "822060 | | Hexamethylene diisocyanate; HDI | 0.005 | 0.034",
"value": "0.005"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",
"source": "https://w... | 822-06-0 | [] | hexamethylene-diisocyanate | null | null | https://www.cdc.gov/niosh/npg/npgd0320.html | NIOSH REL TWA 0.005 ppm (0.035 mg/m3) C 0.020 ppm (0.140 mg/m3) [10-minute] | Hexamethylene diisocyanate | https://referencesource.org/workplace-exposure-limits/hexamethylene-diisocyanate/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 0.035 | TWA 0.005 | null | null | null | null |
null | null | null | hexane-other-isomers | 1800 | 500 | https://www.dir.ca.gov/title8/5155.html | Hexane, other isomers | 500 | 1800 | | 1000 | 3600 | Hexane, other isomers | https://referencesource.org/workplace-exposure-limits/hexane-other-isomers/ | [
"pel_mgm3",
"pel_ppm",
"stel_mgm3",
"stel_ppm",
"substance"
] | null | null | null | null | 3600 | 1000 | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_ppm",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Hexone (Methyl isobutyl ketone) | 108-10-1 | 100 | 410 | - |",
"value": "100"
},
{
"as_of": "2026-08-05T00:00:00",
"fiel... | 108-10-1 | [] | hexone | null | null | https://www.cdc.gov/niosh/npg/npgd0326.html | NIOSH REL TWA 50 ppm (205 mg/m3) ST 75 ppm (300 mg/m3) | Hexone | https://referencesource.org/workplace-exposure-limits/hexone/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 205 | TWA 50 | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0328.html",
"source_quote": "NIOSH REL C 25 ppm (125 mg/m3)",
"value": "C 25"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd... | 107415 | [] | hexylene-glycol | 125 | 25 | https://www.dir.ca.gov/title8/5155.html | 107415 | | Hexylene glycol | 25 | 125 | C | Hexylene glycol | https://referencesource.org/workplace-exposure-limits/hexylene-glycol/ | [
"cas_number",
"ceiling_notation",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | the values given in the PEL columns are ceiling values | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0329.html",
"source_quote": "NIOSH REL Ca C 0.03 ppm (0.04 mg/m3) [2-hour]",
"value": "C 0.03"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.g... | 302-01-2 | [
{
"field": "pel_ppm",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Hydrazine | 302-01-2 | 1 | 1.3 | X |",
"value": "1"
},
{
"as_of": "202... | hydrazine | 1.3 | 1 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Hydrazine | 302-01-2 | 1 | 1.3 | X | | Hydrazine | https://referencesource.org/workplace-exposure-limits/hydrazine/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 1333740 | null | hydrogen | null | null | https://www.dir.ca.gov/title8/5155.html | 1333740 | | Hydrogen | (h) | -- | Hydrogen | https://referencesource.org/workplace-exposure-limits/hydrogen/ | [
"cas_number",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-28T00:00:00",
"field": "ceiling_notation",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "10035106 | | Hydrogen bromide | 3 | 10 | C",
"value": "the values given in the PEL columns are ceiling values"
},
{
"as_of": "2026-09-08T00:00:00",
"fi... | 10035-10-6 | [] | hydrogen-bromide | 10 | 3 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Hydrogen bromide | 10035-10-6 | 3 | 10 | - | | Hydrogen bromide | https://referencesource.org/workplace-exposure-limits/hydrogen-bromide/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-28T00:00:00",
"field": "ceiling",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "7647010 | | Hydrogen chloride | 0.3 | 0.45 | 2 ppm",
"value": "2 ppm"
},
{
"as_of": "2026-09-28T00:00:00",
"field": "ceiling_notation",
"source": "https://w... | 7647-01-0 | [
{
"field": "pel_ppm",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Hydrogen chloride | 7647-01-0 | (C)5 | (C)7 | - |",
"value": "(C)5"
},
{
... | hydrogen-chloride | (C)7 | (C)5 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Hydrogen chloride | 7647-01-0 | (C)5 | (C)7 | - | | Hydrogen chloride | https://referencesource.org/workplace-exposure-limits/hydrogen-chloride/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-28T00:00:00",
"field": "ceiling_notation",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "74908 | S | Hydrogen cyanide | 4.7 | 5 | C",
"value": "the values given in the PEL columns are ceiling values"
},
{
"as_of": "2026-09-08T00:00:00",
"fi... | 74-90-8 | [
{
"field": "pel_ppm",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Hydrogen cyanide | 74-90-8 | 10 | 11 | X |",
"value": "10"
},
{
"as_of... | hydrogen-cyanide | 11 | 10 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Hydrogen cyanide | 74-90-8 | 10 | 11 | X | | Hydrogen cyanide | https://referencesource.org/workplace-exposure-limits/hydrogen-cyanide/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_ppm",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "7664393 | S | Hydrogen fluoride, as F | 0.4 | 0.33 | | 1 | 0.83",
"value": "0.4"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",
"source": "https:... | 7664-39-3 | [] | hydrogen-fluoride | null | null | https://www.cdc.gov/niosh/npg/npgd0334.html | NIOSH REL TWA 3 ppm (2.5 mg/m3) C 6 ppm (5 mg/m3) [15-minute] | Hydrogen fluoride | https://referencesource.org/workplace-exposure-limits/hydrogen-fluoride/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 2.5 | TWA 3 | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0335.html",
"source_quote": "NIOSH REL TWA 1 ppm (1.4 mg/m3)",
"value": "TWA 1"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/np... | 7722-84-1 | [] | hydrogen-peroxide | 1.4 | 1 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Hydrogen peroxide | 7722-84-1 | 1 | 1.4 | - | | Hydrogen peroxide | https://referencesource.org/workplace-exposure-limits/hydrogen-peroxide/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_ppm",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Hydrogen selenide (as Se) | 7783-07-5 | 0.05 | 0.2 | - |",
"value": "0.05"
},
{
"as_of": "2026-08-05T00:00:00",
"field":... | 7783-07-5 | [] | hydrogen-selenide | null | null | https://www.cdc.gov/niosh/npg/npgd0336.html | NIOSH REL TWA 0.05 ppm (0.2 mg/m3) | Hydrogen selenide | https://referencesource.org/workplace-exposure-limits/hydrogen-selenide/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 0.2 | TWA 0.05 | null | null | null | null |
[
{
"as_of": "2026-09-28T00:00:00",
"field": "pel_ppm",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "7783064 | | Hydrogen sulfide | 10 | 14 | 50 ppm | 15 | 21",
"value": "10"
},
{
"as_of": "2026-09-28T00:00:00",
"field": "pel_mgm3",
"source": "https://www.d... | 7783-06-4 | [] | hydrogen-sulfide | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Hydrogen sulfide | 7783-06-4 | - | (2) | - | | Hydrogen sulfide | https://referencesource.org/workplace-exposure-limits/hydrogen-sulfide/ | [
"cas_number",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0330.html",
"source_quote": "NIOSH REL TWA 0.5 ppm (5 mg/m3)",
"value": "TWA 0.5"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/... | 61788327 | [] | hydrogenated-terphenyls | 5 | 0.5 | https://www.dir.ca.gov/title8/5155.html | 61788327 | | Hydrogenated terphenyls | 0.5 | 5 | Hydrogenated terphenyls | https://referencesource.org/workplace-exposure-limits/hydrogenated-terphenyls/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
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