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": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0479.html",
"source_quote": "NIOSH REL TWA 0.05 mg/m3 [skin]",
"value": "TWA 0.05"
}
] | 56-38-2 | [] | parathion | 0.1 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Parathion | 56-38-2 | - | 0.1 | X | | Parathion | https://referencesource.org/workplace-exposure-limits/parathion/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | null | null | particulates-not-otherwise-regulated-total-dust | 10 | null | https://www.dir.ca.gov/title8/5155.html | Particulates not otherwise regulated Total dust | -- | 10 | Particulates not otherwise regulated Total dust | https://referencesource.org/workplace-exposure-limits/particulates-not-otherwise-regulated-total-dust/ | [
"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": "19624227 | | Pentaborane | 0.005 | 0.01 | | 0.015 | 0.03",
"value": "0.015"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "https://w... | 19624-22-7 | [] | pentaborane | 0.01 | 0.005 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Pentaborane | 19624-22-7 | 0.005 | 0.01 | - | | Pentaborane | https://referencesource.org/workplace-exposure-limits/pentaborane/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 76-01-7 | null | pentachloroethane | null | null | https://www.cdc.gov/niosh/npg/npgd0482.html | NIOSH REL Handle with care in the workplace. See Appendix C (Chloroethanes) | Pentachloroethane | https://referencesource.org/workplace-exposure-limits/pentachloroethane/ | [
"cas_number",
"rel_statement",
"substance"
] | Handle with care in the workplace. See Appendix C (Chloroethanes) | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0483.html",
"source_quote": "NIOSH REL TWA 0.5 mg/m3 [skin]",
"value": "TWA 0.5"
}
] | 1321-64-8 | [] | pentachloronaphthalene | 0.5 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Pentachloronaphthalene | 1321-64-8 | - | 0.5 | X | | Pentachloronaphthalene | https://referencesource.org/workplace-exposure-limits/pentachloronaphthalene/ | [
"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/npgd0484.html",
"source_quote": "NIOSH REL TWA 0.5 mg/m3 [skin]",
"value": "TWA 0.5"
}
] | 87-86-5 | [] | pentachlorophenol | 0.5 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Pentachlorophenol | 87-86-5 | - | 0.5 | X | | Pentachlorophenol | https://referencesource.org/workplace-exposure-limits/pentachlorophenol/ | [
"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/npgd0485.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)"
}
] | 115-77-5 | [] | pentaerythritol | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Pentaerythritol | 115-77-5 | - | - | - | | Pentaerythritol | https://referencesource.org/workplace-exposure-limits/pentaerythritol/ | [
"cas_number",
"substance"
] | null | null | null | null | null | null | null |
null | 628637; 626380; 123922; 625161; 620111; 624419 | null | pentyl-acetate | 266 | 50 | https://www.dir.ca.gov/title8/5155.html | 628637; 626380; 123922; 625161; 620111; 624419 | | Pentyl acetate | 50 | 266 | | 100 | 532 | Pentyl acetate | https://referencesource.org/workplace-exposure-limits/pentyl-acetate/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"stel_mgm3",
"stel_ppm",
"substance"
] | null | null | null | null | 532 | 100 | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_statement",
"source": "https://www.cdc.gov/niosh/npg/npgd0599.html",
"source_quote": "NIOSH REL Ca Minimize workplace exposure concentrations. See Appendix A",
"value": "Ca Minimize workplace exposure concentrations. See Appendix A"
}
] | 127184 | [] | perchloroethylene | 170 | 25 | https://www.dir.ca.gov/title8/5155.html | 127184 | | Perchloroethylene | 25 | 170 | 300 ppm | 100 | 685 | Perchloroethylene | https://referencesource.org/workplace-exposure-limits/perchloroethylene/ | [
"cas_number",
"ceiling",
"ceiling_notation",
"pel_mgm3",
"pel_ppm",
"stel_mgm3",
"stel_ppm",
"substance"
] | null | null | null | a ceiling value in addition to the TWA values | 685 | 100 | 300 ppm |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0489.html",
"source_quote": "NIOSH REL TWA 0.1 ppm (0.8 mg/m3)",
"value": "TWA 0.1"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/np... | 594-42-3 | [] | perchloromethyl-mercaptan | 0.8 | 0.1 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Perchloromethyl mercaptan | 594-42-3 | 0.1 | 0.8 | - | | Perchloromethyl mercaptan | https://referencesource.org/workplace-exposure-limits/perchloromethyl-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/npgd0490.html",
"source_quote": "NIOSH REL TWA 3 ppm (14 mg/m3) ST 6 ppm (28 mg/m3)",
"value": "TWA 3"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.c... | 7616-94-6 | [
{
"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": "Perchloryl fluoride | 7616-94-6 | 3 | 13.5 | - |",
"value": "13.5"
},
{
... | perchloryl-fluoride | 13.5 | 3 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Perchloryl fluoride | 7616-94-6 | 3 | 13.5 | - | | Perchloryl fluoride | https://referencesource.org/workplace-exposure-limits/perchloryl-fluoride/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 382218 | null | perfluoroisobutylene | 0.082 | 0.01 | https://www.dir.ca.gov/title8/5155.html | 382218 | | Perfluoroisobutylene | 0.01 | 0.082 | C | Perfluoroisobutylene | https://referencesource.org/workplace-exposure-limits/perfluoroisobutylene/ | [
"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 |
null | 93763-70-3 | null | perlite | null | null | https://www.cdc.gov/niosh/npg/npgd0491.html | NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp) | Perlite | https://referencesource.org/workplace-exposure-limits/perlite/ | [
"cas_number",
"rel_statement",
"substance"
] | TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp) | null | null | null | null | null | null |
null | 8002-05-9 | null | petroleum-distillates-naphtha | null | null | https://www.cdc.gov/niosh/npg/npgd0492.html | NIOSH REL TWA 350 mg/m3 C 1800 mg/m3 [15-minute] | Petroleum distillates (naphtha) | https://referencesource.org/workplace-exposure-limits/petroleum-distillates-naphtha/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 350 | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0493.html",
"source_quote": "NIOSH REL TWA 5 ppm (19 mg/m3) C 15.6 ppm (60 mg/m3) [15-minute] [skin]",
"value": "TWA 5"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"so... | 108-95-2 | [] | phenol | 19 | 5 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Phenol | 108-95-2 | 5 | 19 | X | | Phenol | https://referencesource.org/workplace-exposure-limits/phenol/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"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": "92842 | S | Phenothiazine; dibenzothiazine | -- | 5",
"value": "5"
}
] | 92-84-2 | [] | phenothiazine | null | null | https://www.cdc.gov/niosh/npg/npgd0494.html | NIOSH REL TWA 5 mg/m3 [skin] | Phenothiazine | https://referencesource.org/workplace-exposure-limits/phenothiazine/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 5 | null | null | null | null | null |
null | 8004-13-5 | null | phenyl-ether-biphenyl-mixture-vapor | null | null | https://www.cdc.gov/niosh/npg/npgd0683.html | NIOSH REL TWA 1 ppm (7 mg/m3) | Phenyl ether-biphenyl mixture (vapor) | https://referencesource.org/workplace-exposure-limits/phenyl-ether-biphenyl-mixture-vapor/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 7 | TWA 1 | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0496.html",
"source_quote": "NIOSH REL TWA 1 ppm (7 mg/m3)",
"value": "TWA 1"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd... | 101-84-8 | [] | phenyl-ether-vapor | 7 | 1 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Phenyl ether, vapor | 101-84-8 | 1 | 7 | - | | Phenyl ether, vapor | https://referencesource.org/workplace-exposure-limits/phenyl-ether-vapor/ | [
"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": "Phenyl glycidyl ether (PGE) | 122-60-1 | 10 | 60 | - |",
"value": "10"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "pe... | 122-60-1 | [] | phenyl-glycidyl-ether | null | null | https://www.cdc.gov/niosh/npg/npgd0498.html | NIOSH REL Ca C 1 ppm (6 mg/m3) [15-minute] | Phenyl glycidyl ether | https://referencesource.org/workplace-exposure-limits/phenyl-glycidyl-ether/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 6 | C 1 | 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": "100630 | S | Phenylhydrazine | 5 | 20 | | 10 | 45",
"value": "10"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "https://www.dir.ca.... | 100-63-0 | [
{
"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": "Phenylhydrazine | 100-63-0 | 5 | 22 | X |",
"value": "22"
},
{
"as_of... | phenylhydrazine | 22 | 5 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Phenylhydrazine | 100-63-0 | 5 | 22 | X | | Phenylhydrazine | https://referencesource.org/workplace-exposure-limits/phenylhydrazine/ | [
"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/npgd0501.html",
"source_quote": "NIOSH REL C 0.05 ppm (0.25 mg/m3)",
"value": "C 0.05"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg... | 638211 | [] | phenylphosphine | 0.25 | 0.05 | https://www.dir.ca.gov/title8/5155.html | 638211 | | Phenylphosphine | 0.05 | 0.25 | C | Phenylphosphine | https://referencesource.org/workplace-exposure-limits/phenylphosphine/ | [
"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": "2026-08-05T00:00:00",
"field": "pel_mgm3",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "298022 | S | Phorate; o,o-diethyl S-(ethylthio)methyl phosphorodithioate | -- | 0.05 | | -- | 0.2",
"value": "0.05"
},
{
"as_of": "2026-08-05T00:00:00",
"field... | 298-02-2 | [] | phorate | null | null | https://www.cdc.gov/niosh/npg/npgd0502.html | NIOSH REL TWA 0.05 mg/m3 ST 0.2 mg/m3 [skin] | Phorate | https://referencesource.org/workplace-exposure-limits/phorate/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 0.05 | 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": "Phosgene (Carbonyl chloride) | 75-44-5 | 0.1 | 0.4 | - |",
"value": "0.1"
},
{
"as_of": "2026-08-05T00:00:00",
"field": ... | 75-44-5 | [] | phosgene | null | null | https://www.cdc.gov/niosh/npg/npgd0504.html | NIOSH REL TWA 0.1 ppm (0.4 mg/m3) C 0.2 ppm (0.8 mg/m3) [15-minute] | Phosgene | https://referencesource.org/workplace-exposure-limits/phosgene/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 0.4 | TWA 0.1 | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0505.html",
"source_quote": "NIOSH REL TWA 0.3 ppm (0.4 mg/m3) ST 1 ppm (1 mg/m3)",
"value": "TWA 0.3"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://w... | 7803-51-2 | [] | phosphine | 0.4 | 0.3 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Phosphine | 7803-51-2 | 0.3 | 0.4 | - | | Phosphine | https://referencesource.org/workplace-exposure-limits/phosphine/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"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": "7664382 | | Phosphoric acid | -- | 1 | | -- | 3",
"value": "3"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/ni... | 7664-38-2 | [] | phosphoric-acid | 1 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Phosphoric acid | 7664-38-2 | - | 1 | - | | Phosphoric acid | https://referencesource.org/workplace-exposure-limits/phosphoric-acid/ | [
"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/npgd0508.html",
"source_quote": "NIOSH REL TWA 0.1 ppm (0.6 mg/m3) ST 0.5 ppm (3 mg/m3)",
"value": "TWA 0.1"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https:/... | 10025873 | [] | phosphorus-oxychloride | 0.6 | 0.1 | https://www.dir.ca.gov/title8/5155.html | 10025873 | | Phosphorus oxychloride | 0.1 | 0.6 | Phosphorus oxychloride | https://referencesource.org/workplace-exposure-limits/phosphorus-oxychloride/ | [
"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": "10026138 | | Phosphorus pentachloride | 0.1 | 1",
"value": "0.1"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/ni... | 10026-13-8 | [] | phosphorus-pentachloride | 1 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Phosphorus pentachloride | 10026-13-8 | - | 1 | - | | Phosphorus pentachloride | https://referencesource.org/workplace-exposure-limits/phosphorus-pentachloride/ | [
"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/npgd0510.html",
"source_quote": "NIOSH REL TWA 1 mg/m3 ST 3 mg/m3",
"value": "TWA 1"
},
{
"as_of": "2026-09-25T00:00:00",
"field": "stel_mgm3",
"source": "https://www.dir.ca.gov/title8... | 1314-80-3 | [] | phosphorus-pentasulfide | 1 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Phosphorus pentasulfide | 1314-80-3 | - | 1 | - | | Phosphorus pentasulfide | https://referencesource.org/workplace-exposure-limits/phosphorus-pentasulfide/ | [
"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": "7719122 | | Phosphorus trichloride | 0.2 | 1.5 | | 0.5 | 3",
"value": "0.5"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "https://w... | 7719-12-2 | [
{
"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": "Phosphorus trichloride | 7719-12-2 | 0.5 | 3 | - |",
"value": "0.5"
},
{
... | phosphorus-trichloride | 3 | 0.5 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Phosphorus trichloride | 7719-12-2 | 0.5 | 3 | - | | Phosphorus trichloride | https://referencesource.org/workplace-exposure-limits/phosphorus-trichloride/ | [
"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/npgd0507.html",
"source_quote": "NIOSH REL TWA 0.1 mg/m3",
"value": "TWA 0.1"
}
] | 7723-14-0 | [] | phosphorus-yellow | 0.1 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Phosphorus (yellow) | 7723-14-0 | - | 0.1 | - | | Phosphorus (yellow) | https://referencesource.org/workplace-exposure-limits/phosphorus-yellow/ | [
"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/npgd0512.html",
"source_quote": "NIOSH REL TWA 6 mg/m3 (1 ppm)",
"value": "1"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0512... | 85-44-9 | [
{
"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": "Phthalic anhydride | 85-44-9 | 2 | 12 | - |",
"value": "2"
},
{
"as_of... | phthalic-anhydride | 12 | 2 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Phthalic anhydride | 85-44-9 | 2 | 12 | - | | Phthalic anhydride | https://referencesource.org/workplace-exposure-limits/phthalic-anhydride/ | [
"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/npgd0514.html",
"source_quote": "NIOSH REL See Appendix D",
"value": "See Appendix D"
}
] | 1918-02-1 | [] | picloram | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Picloram | 1918-02-1 | - | - | - | | Picloram | https://referencesource.org/workplace-exposure-limits/picloram/ | [
"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/npgd0515.html",
"source_quote": "NIOSH REL TWA 0.1 mg/m3 ST 0.3 mg/m3 [skin]",
"value": "TWA 0.1"
}
] | 88-89-1 | [] | picric-acid | 0.1 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Picric acid | 88-89-1 | - | 0.1 | X | | Picric acid | https://referencesource.org/workplace-exposure-limits/picric-acid/ | [
"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.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Pindone (2-Pivalyl-1,3-indandione) | 83-26-1 | - | 0.1 | - |",
"value": "0.1"
}
] | 83-26-1 | [] | pindone | null | null | https://www.cdc.gov/niosh/npg/npgd0516.html | NIOSH REL TWA 0.1 mg/m3 | Pindone | https://referencesource.org/workplace-exposure-limits/pindone/ | [
"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/npgd0517.html",
"source_quote": "NIOSH REL TWA 5 mg/m3",
"value": "TWA 5"
}
] | 142643 | [] | piperazine-dihydrochloride | 5 | null | https://www.dir.ca.gov/title8/5155.html | 142643 | | Piperazine dihydrochloride | -- | 5 | Piperazine dihydrochloride | https://referencesource.org/workplace-exposure-limits/piperazine-dihydrochloride/ | [
"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/npgd0518.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)"
}
] | 26499-65-0 | [] | plaster-of-paris | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Plaster of Paris | 26499-65-0 | - | - | - | | Plaster of Paris | https://referencesource.org/workplace-exposure-limits/plaster-of-paris/ | [
"cas_number",
"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": "7440064 | | Platinum, metal | -- | 1",
"value": "1"
}
] | 7440-06-4 | [] | platinum | null | null | https://www.cdc.gov/niosh/npg/npgd0519.html | NIOSH REL TWA 1 mg/m3 | Platinum | https://referencesource.org/workplace-exposure-limits/platinum/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 1 | null | null | null | null | null |
null | null | null | platinum-soluble-salts-as-pt | 0.002 | null | https://www.dir.ca.gov/title8/5155.html | Platinum, soluble salts, as Pt | -- | 0.002 | Platinum, soluble salts, as Pt | https://referencesource.org/workplace-exposure-limits/platinum-soluble-salts-as-pt/ | [
"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/npgd0521.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)"
}
] | 65997-15-1 | [] | portland-cement | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Portland cement | 65997-15-1 | - | - | - | | Portland cement | https://referencesource.org/workplace-exposure-limits/portland-cement/ | [
"cas_number",
"substance"
] | null | null | null | null | null | null | null |
null | 151-50-8 | null | potassium-cyanide-as-cn | null | null | https://www.cdc.gov/niosh/npg/npgd0522.html | NIOSH REL C 5 mg/m3 (4.7 ppm) [10-minute] | Potassium cyanide (as CN) | https://referencesource.org/workplace-exposure-limits/potassium-cyanide-as-cn/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | C 5 | 4.7 | null | null | null | null |
[
{
"as_of": "2026-09-28T00:00:00",
"field": "pel_mgm3",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "1310583 | | Potassium hydroxide; caustic potash | -- | 2 | C",
"value": "2"
},
{
"as_of": "2026-09-28T00:00:00",
"field": "ceiling_notation",
"source": "ht... | 1310-58-3 | [] | potassium-hydroxide | null | null | https://www.cdc.gov/niosh/npg/npgd0523.html | NIOSH REL C 2 mg/m3 | Potassium hydroxide | https://referencesource.org/workplace-exposure-limits/potassium-hydroxide/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | C 2 | null | null | null | null | null |
null | 593293 | null | potassium-stearate | 10 | null | https://www.dir.ca.gov/title8/5155.html | 593293 | | Potassium stearate | -- | 10 | Potassium stearate | https://referencesource.org/workplace-exposure-limits/potassium-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/npgd0524.html",
"source_quote": "NIOSH REL TWA 1000 ppm (1800 mg/m3)",
"value": "TWA 1000"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh... | 74-98-6 | [
{
"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": "Propane | 74-98-6 | 1000 | 1800 | - |",
"value": "1800"
},
{
"as_of":... | propane | 1800 | 1000 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Propane | 74-98-6 | 1000 | 1800 | - | | Propane | https://referencesource.org/workplace-exposure-limits/propane/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 1120-71-4 | null | propane-sultone | null | null | https://www.cdc.gov/niosh/npg/npgd0525.html | NIOSH REL Ca See Appendix A | Propane sultone | https://referencesource.org/workplace-exposure-limits/propane-sultone/ | [
"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": "107197 | S | Propargyl alcohol; 2-propyn-1-o1 | 1 | 2",
"value": "1"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",
"source": "https://www.dir.ca... | 107-19-7 | [] | propargyl-alcohol | null | null | https://www.cdc.gov/niosh/npg/npgd0527.html | NIOSH REL TWA 1 ppm (2 mg/m3) [skin] | Propargyl alcohol | https://referencesource.org/workplace-exposure-limits/propargyl-alcohol/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 2 | TWA 1 | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0529.html",
"source_quote": "NIOSH REL TWA 10 ppm (30 mg/m3) ST 15 ppm (45 mg/m3)",
"value": "TWA 10"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://ww... | 79094 | [] | propionic-acid | 30 | 10 | https://www.dir.ca.gov/title8/5155.html | 79094 | | Propionic acid | 10 | 30 | Propionic acid | https://referencesource.org/workplace-exposure-limits/propionic-acid/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 107-12-0 | null | propionitrile | null | null | https://www.cdc.gov/niosh/npg/npgd0530.html | NIOSH REL TWA 6 ppm (14 mg/m3) | Propionitrile | https://referencesource.org/workplace-exposure-limits/propionitrile/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 14 | TWA 6 | 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": "114261 | | Propoxur; 2-isopropoxyphenyl N-methyl carbamate | | 0.5",
"value": "0.5"
}
] | 114-26-1 | [] | propoxur | null | null | https://www.cdc.gov/niosh/npg/npgd0531.html | NIOSH REL TWA 0.5 mg/m3 | Propoxur | https://referencesource.org/workplace-exposure-limits/propoxur/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 0.5 | null | null | null | null | null |
null | 115071 | null | propylene | null | null | https://www.dir.ca.gov/title8/5155.html | 115071 | | Propylene | (h) | -- | Propylene | https://referencesource.org/workplace-exposure-limits/propylene/ | [
"cas_number",
"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": "78875 | | Propylene dichloride; 1,2-dichloropropane | 75 | 350 | | 110 | 510",
"value": "110"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"s... | 78-87-5 | [] | propylene-dichloride | 350 | 75 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Propylene dichloride | 78-87-5 | 75 | 350 | - | | Propylene dichloride | https://referencesource.org/workplace-exposure-limits/propylene-dichloride/ | [
"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": "6423434 | S | Propylene glycol dinitrate; PGDN | 0.05 | 0.3",
"value": "0.05"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",
"source": "https://w... | 6423-43-4 | [] | propylene-glycol-dinitrate | null | null | https://www.cdc.gov/niosh/npg/npgd0535.html | NIOSH REL TWA 0.05 ppm (0.3 mg/m3) [skin] | Propylene glycol dinitrate | https://referencesource.org/workplace-exposure-limits/propylene-glycol-dinitrate/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 0.3 | TWA 0.05 | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0536.html",
"source_quote": "NIOSH REL TWA 100 ppm (360 mg/m3) ST 150 ppm (540 mg/m3)",
"value": "TWA 100"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https... | 107982 | [] | propylene-glycol-monomethyl-ether | 360 | 100 | https://www.dir.ca.gov/title8/5155.html | 107982 | S | Propylene glycol monomethyl ether | 100 | 360 | | 150 | 540 | Propylene glycol monomethyl ether | https://referencesource.org/workplace-exposure-limits/propylene-glycol-monomethyl-ether/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"stel_mgm3",
"stel_ppm",
"substance"
] | null | null | null | null | 540 | 150 | null |
null | 108656 | null | propylene-glycol-monomethyl-ether-acetate | 541 | 100 | https://www.dir.ca.gov/title8/5155.html | 108656 | S | Propylene glycol monomethyl ether acetate | 100 | 541 | | 150 | 811 | Propylene glycol monomethyl ether acetate | https://referencesource.org/workplace-exposure-limits/propylene-glycol-monomethyl-ether-acetate/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"stel_mgm3",
"stel_ppm",
"substance"
] | null | null | null | null | 811 | 150 | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0537.html",
"source_quote": "NIOSH REL Ca TWA 2 ppm (5 mg/m3) [skin]",
"value": "TWA 2"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/nios... | 75-55-8 | [] | propylene-imine | 5 | 2 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Propylene imine | 75-55-8 | 2 | 5 | X | | Propylene imine | https://referencesource.org/workplace-exposure-limits/propylene-imine/ | [
"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/npgd0538.html",
"source_quote": "NIOSH REL Ca See Appendix A",
"value": "Ca See Appendix A"
}
] | 75-56-9 | [
{
"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": "Propylene oxide | 75-56-9 | 100 | 240 | - |",
"value": "100"
},
{
"as_... | propylene-oxide | 240 | 100 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Propylene oxide | 75-56-9 | 100 | 240 | - | | Propylene oxide | https://referencesource.org/workplace-exposure-limits/propylene-oxide/ | [
"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/npgd0685.html",
"source_quote": "NIOSH REL TWA 5 mg/m3",
"value": "TWA 5"
}
] | 8003-34-7 | [] | pyrethrum | 5 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Pyrethrum | 8003-34-7 | - | 5 | - | | Pyrethrum | https://referencesource.org/workplace-exposure-limits/pyrethrum/ | [
"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/npgd0541.html",
"source_quote": "NIOSH REL TWA 5 ppm (15 mg/m3)",
"value": "TWA 5"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npg... | 110-86-1 | [] | pyridine | 15 | 5 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Pyridine | 110-86-1 | 5 | 15 | - | | Pyridine | https://referencesource.org/workplace-exposure-limits/pyridine/ | [
"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/npgd0684.html",
"source_quote": "NIOSH REL Ca TWA 0.05 mg/m³",
"value": "TWA 0.05"
}
] | 14808607 | [] | quartz | 0.05 | null | https://www.dir.ca.gov/title8/5155.html | 14808607 | | Quartz, | -- | 0.05 | Quartz, | https://referencesource.org/workplace-exposure-limits/quartz/ | [
"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/npgd0542.html",
"source_quote": "NIOSH REL TWA 0.4 mg/m3 (0.1 ppm)",
"value": "0.1"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/np... | 106-51-4 | [] | quinone | 0.4 | 0.1 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Quinone | 106-51-4 | 0.1 | 0.4 | - | | Quinone | https://referencesource.org/workplace-exposure-limits/quinone/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | null | null | refractory-ceramic-fiber | 0.2 f/cc(q) | null | https://www.dir.ca.gov/title8/5155.html | Refractory ceramic fiber | | 0.2 f/cc(q) | Refractory ceramic fiber | https://referencesource.org/workplace-exposure-limits/refractory-ceramic-fiber/ | [
"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/npgd0543.html",
"source_quote": "NIOSH REL TWA 10 ppm (45 mg/m3) ST 20 ppm (90 mg/m3)",
"value": "TWA 10"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://ww... | 108463 | [] | resorcinol | 45 | 10 | https://www.dir.ca.gov/title8/5155.html | 108463 | | Resorcinol | 10 | 45 | | 20 | 90 | Resorcinol | https://referencesource.org/workplace-exposure-limits/resorcinol/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"stel_mgm3",
"stel_ppm",
"substance"
] | null | null | null | null | 90 | 20 | null |
null | 7440-16-6 | null | rhodium-as-rh-metal-fume-and-insoluble-compounds | 0.1 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Rhodium (as Rh), metal fume and insoluble compounds | 7440-16-6 | - | 0.1 | - | | Rhodium (as Rh), metal fume and insoluble compounds | https://referencesource.org/workplace-exposure-limits/rhodium-as-rh-metal-fume-and-insoluble-compounds/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 7440-16-6 | null | rhodium-as-rh-soluble-compounds | 0.001 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Rhodium (as Rh), soluble compounds | 7440-16-6 | - | 0.001 | - | | Rhodium (as Rh), soluble compounds | https://referencesource.org/workplace-exposure-limits/rhodium-as-rh-soluble-compounds/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 7440166 | null | rhodium-metal | 0.1 | null | https://www.dir.ca.gov/title8/5155.html | 7440166 | | Rhodium, metal | -- | 0.1 | Rhodium, metal | https://referencesource.org/workplace-exposure-limits/rhodium-metal/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 7440-16-6 (metal) | null | rhodium-metal-fume-and-insoluble-compounds-as-rh | null | null | https://www.cdc.gov/niosh/npg/npgd0544.html | NIOSH REL TWA 0.1 mg/m3 | Rhodium (metal fume and insoluble compounds, as Rh) | https://referencesource.org/workplace-exposure-limits/rhodium-metal-fume-and-insoluble-compounds-as-rh/ | [
"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/npgd0546.html",
"source_quote": "NIOSH REL TWA 10 mg/m3",
"value": "TWA 10"
}
] | 299-84-3 | [
{
"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": "Ronnel | 299-84-3 | - | 15 | - |",
"value": "15"
},
{
"as_of": "2026-... | ronnel | 15 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Ronnel | 299-84-3 | - | 15 | - | | Ronnel | https://referencesource.org/workplace-exposure-limits/ronnel/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | null | null | rosin-core-solder-pyrolysis-products-as-formaldehyde | 0.1 | null | https://www.dir.ca.gov/title8/5155.html | Rosin core solder, pyrolysis products, as formaldehyde | -- | 0.1 | Rosin core solder, pyrolysis products, as formaldehyde | https://referencesource.org/workplace-exposure-limits/rosin-core-solder-pyrolysis-products-as-formaldehyde/ | [
"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/npgd0548.html",
"source_quote": "NIOSH REL TWA 5 mg/m3",
"value": "TWA 5"
}
] | 83-79-4 | [] | rotenone | 5 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Rotenone | 83-79-4 | - | 5 | - | | Rotenone | https://referencesource.org/workplace-exposure-limits/rotenone/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | null | null | rubber-solvent-naphtha | 1,600 | 400 | https://www.dir.ca.gov/title8/5155.html | Rubber solvent (Naphtha) | 400 | 1,600 | Rubber solvent (Naphtha) | https://referencesource.org/workplace-exposure-limits/rubber-solvent-naphtha/ | [
"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/npgd0032.html",
"source_quote": "NIOSH REL TWA 125 ppm (650 mg/m3)",
"value": "TWA 125"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/np... | 626-38-0 | [] | sec-amyl-acetate | 650 | 125 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | sec-Amyl acetate | 626-38-0 | 125 | 650 | - | | sec-Amyl acetate | https://referencesource.org/workplace-exposure-limits/sec-amyl-acetate/ | [
"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/npgd0073.html",
"source_quote": "NIOSH REL TWA 200 ppm (950 mg/m3)",
"value": "TWA 200"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/np... | 105-46-4 | [] | sec-butyl-acetate | 950 | 200 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | sec-Butyl acetate | 105-46-4 | 200 | 950 | - | | sec-Butyl acetate | https://referencesource.org/workplace-exposure-limits/sec-butyl-acetate/ | [
"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/npgd0077.html",
"source_quote": "NIOSH REL TWA 100 ppm (305 mg/m3) ST 150 ppm (455 mg/m3)",
"value": "TWA 100"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https... | 78-92-2 | [
{
"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": "sec-Butyl alcohol | 78-92-2 | 150 | 450 | - |",
"value": "150"
},
{
"a... | sec-butyl-alcohol | 450 | 150 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | sec-Butyl alcohol | 78-92-2 | 150 | 450 | - | | sec-Butyl alcohol | https://referencesource.org/workplace-exposure-limits/sec-butyl-alcohol/ | [
"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/npgd0327.html",
"source_quote": "NIOSH REL TWA 50 ppm (300 mg/m3)",
"value": "TWA 50"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/... | 108-84-9 | [] | sec-hexyl-acetate | 300 | 50 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | sec-Hexyl acetate | 108-84-9 | 50 | 300 | - | | sec-Hexyl acetate | https://referencesource.org/workplace-exposure-limits/sec-hexyl-acetate/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Selenium compounds (as Se) | 7782-49-2 | - | 0.2 | - |",
"value": "0.2"
}
] | 7782-49-2 | [] | selenium | null | null | https://www.cdc.gov/niosh/npg/npgd0550.html | NIOSH REL TWA 0.2 mg/m3 | Selenium | https://referencesource.org/workplace-exposure-limits/selenium/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 0.2 | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0551.html",
"source_quote": "NIOSH REL TWA 0.05 ppm",
"value": "TWA 0.05"
}
] | 7783791 | [] | selenium-hexafluoride | 0.4 | 0.05 | https://www.dir.ca.gov/title8/5155.html | 7783791 | | Selenium hexafluoride | 0.05 | 0.4 | Selenium hexafluoride | https://referencesource.org/workplace-exposure-limits/selenium-hexafluoride/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 7631-86-9 | null | silica-amorphous | null | null | https://www.cdc.gov/niosh/npg/npgd0552.html | NIOSH REL TWA 6 mg/m3 | Silica, amorphous | https://referencesource.org/workplace-exposure-limits/silica-amorphous/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 6 | null | null | null | null | null |
null | 61790532 | [] | silica-amorphous-diatomaceous-earth | null | null | https://www.dir.ca.gov/title8/5155.html | 61790532 | | Silica, amorphous Diatomaceous earth | Silica, amorphous Diatomaceous earth | https://referencesource.org/workplace-exposure-limits/silica-amorphous-diatomaceous-earth/ | [
"cas_number",
"substance"
] | null | null | null | null | null | null | null |
null | 112926-00-8 | null | silica-amorphous-precipitated-and-gel | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Silica, amorphous, precipitated and gel | 112926-00-8 | - | (3) | - | | Silica, amorphous, precipitated and gel | https://referencesource.org/workplace-exposure-limits/silica-amorphous-precipitated-and-gel/ | [
"cas_number",
"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": "60676860 | | Silica, fused, respirable dust | -- | 0.1",
"value": "0.1"
}
] | 60676-86-0 | [] | silica-fused-respirable-dust | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Silica, fused, respirable dust | 60676-86-0 | - | (3) | - | | Silica, fused, respirable dust | https://referencesource.org/workplace-exposure-limits/silica-fused-respirable-dust/ | [
"cas_number",
"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/npgd0554.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)"
}
] | 7440-21-3 | [] | silicon | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Silicon | 7440-21-3 | - | - | - | | Silicon | https://referencesource.org/workplace-exposure-limits/silicon/ | [
"cas_number",
"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/npgd0555.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)"
}
] | 409-21-2 | [] | silicon-carbide | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Silicon carbide | 409-21-2 | - | - | - | | Silicon carbide | https://referencesource.org/workplace-exposure-limits/silicon-carbide/ | [
"cas_number",
"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": "7803625 | | Silicon tetrahydride; silane | 5 | 7",
"value": "5"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",
"source": "https://www.dir.ca.gov/... | 7803-62-5 | [] | silicon-tetrahydride | null | null | https://www.cdc.gov/niosh/npg/npgd0556.html | NIOSH REL TWA 5 ppm (7 mg/m3) | Silicon tetrahydride | https://referencesource.org/workplace-exposure-limits/silicon-tetrahydride/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 7 | TWA 5 | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0557.html",
"source_quote": "NIOSH REL TWA 0.01 mg/m3",
"value": "TWA 0.01"
}
] | 7440-22-4 | [] | silver-metal-and-soluble-compounds-as-ag | 0.01 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Silver, metal and soluble compounds (as Ag) | 7440-22-4 | - | 0.01 | - | | Silver, metal and soluble compounds (as Ag) | https://referencesource.org/workplace-exposure-limits/silver-metal-and-soluble-compounds-as-ag/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | null | null | silver-soluble-compounds-as-ag | 0.01 | null | https://www.dir.ca.gov/title8/5155.html | Silver, soluble compounds, as Ag | -- | 0.01 | Silver, soluble compounds, as Ag | https://referencesource.org/workplace-exposure-limits/silver-soluble-compounds-as-ag/ | [
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | null | null | soapstone-respirable-dust | 3 | null | https://www.dir.ca.gov/title8/5155.html | Soapstone, respirable dust | -- | 3 | Soapstone, respirable dust | https://referencesource.org/workplace-exposure-limits/soapstone-respirable-dust/ | [
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | null | null | soapstone-total-dust | 6 | null | https://www.dir.ca.gov/title8/5155.html | Soapstone, total dust | -- | 6 | Soapstone, total dust | https://referencesource.org/workplace-exposure-limits/soapstone-total-dust/ | [
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 15096-52-3 | null | sodium-aluminum-fluoride-as-f | null | null | https://www.cdc.gov/niosh/npg/npgd0559.html | NIOSH REL TWA 2.5 mg/m3 | Sodium aluminum fluoride (as F) | https://referencesource.org/workplace-exposure-limits/sodium-aluminum-fluoride-as-f/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 2.5 | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_statement",
"source": "https://www.cdc.gov/niosh/npg/npgd0560.html",
"source_quote": "NIOSH REL C 0.1 ppm (as HN3) [skin] C 0.3 mg/m3 (as NaN3) [skin]",
"value": "C 0.1 ppm (as HN3) [skin] C 0.3 mg/m3 (as NaN3) [skin]"
}
] | 26628228 | [] | sodium-azide | 0.3 | 0.1 | https://www.dir.ca.gov/title8/5155.html | 26628228 | S | Sodium azide | 0.1 | 0.3 | C | Sodium azide | https://referencesource.org/workplace-exposure-limits/sodium-azide/ | [
"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/npgd0561.html",
"source_quote": "NIOSH REL TWA 5 mg/m3",
"value": "TWA 5"
}
] | 7631905 | [] | sodium-bisulfite | 5 | null | https://www.dir.ca.gov/title8/5155.html | 7631905 | | Sodium bisulfite | -- | 5 | Sodium bisulfite | https://referencesource.org/workplace-exposure-limits/sodium-bisulfite/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 143-33-9 | null | sodium-cyanide-as-cn | null | null | https://www.cdc.gov/niosh/npg/npgd0562.html | NIOSH REL C 5 mg/m3 (4.7 ppm) [10-minute] | Sodium cyanide (as CN) | https://referencesource.org/workplace-exposure-limits/sodium-cyanide-as-cn/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | C 5 | 4.7 | null | null | null | null |
null | 7681-49-4 | null | sodium-fluoride-as-f | null | null | https://www.cdc.gov/niosh/npg/npgd0563.html | NIOSH REL TWA 2.5 mg/m3 | Sodium fluoride (as F) | https://referencesource.org/workplace-exposure-limits/sodium-fluoride-as-f/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 2.5 | 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": "62748 | S | Sodium fluoroacetate | -- | 0.05 | | -- | 0.15",
"value": "0.15"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://... | 62-74-8 | [] | sodium-fluoroacetate | 0.05 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Sodium fluoroacetate | 62-74-8 | - | 0.05 | X | | Sodium fluoroacetate | https://referencesource.org/workplace-exposure-limits/sodium-fluoroacetate/ | [
"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/npgd0565.html",
"source_quote": "NIOSH REL C 2 mg/m3",
"value": "C 2"
},
{
"as_of": "2026-09-28T00:00:00",
"field": "ceiling_notation",
"source": "https://www.dir.ca.gov/title8/5155.ht... | 1310-73-2 | [] | sodium-hydroxide | 2 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Sodium hydroxide | 1310-73-2 | - | 2 | - | | Sodium hydroxide | https://referencesource.org/workplace-exposure-limits/sodium-hydroxide/ | [
"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/npgd0566.html",
"source_quote": "NIOSH REL TWA 5 mg/m3",
"value": "TWA 5"
}
] | 7681574 | [] | sodium-metabisulfite | 5 | null | https://www.dir.ca.gov/title8/5155.html | 7681574 | | Sodium metabisulfite | -- | 5 | Sodium metabisulfite | https://referencesource.org/workplace-exposure-limits/sodium-metabisulfite/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 822162 | null | sodium-stearate | 10 | null | https://www.dir.ca.gov/title8/5155.html | 822162 | | Sodium stearate | -- | 10 | Sodium stearate | https://referencesource.org/workplace-exposure-limits/sodium-stearate/ | [
"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/npgd0567.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)"
}
] | 9005-25-8 | [] | starch | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Starch | 9005-25-8 | - | - | - | | Starch | https://referencesource.org/workplace-exposure-limits/starch/ | [
"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/npgd0568.html",
"source_quote": "NIOSH REL TWA 0.1 ppm (0.5 mg/m3)",
"value": "TWA 0.1"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/np... | 7803-52-3 | [] | stibine | 0.5 | 0.1 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Stibine | 7803-52-3 | 0.1 | 0.5 | - | | Stibine | https://referencesource.org/workplace-exposure-limits/stibine/ | [
"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/npgd0569.html",
"source_quote": "NIOSH REL TWA 350 mg/m3 C 1800 mg/m3 [15-minute]",
"value": "TWA 350"
}
] | 8052-41-3 | [
{
"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": "Stoddard solvent | 8052-41-3 | 500 | 2900 | - |",
"value": "500"
},
{
... | stoddard-solvent | 2900 | 500 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Stoddard solvent | 8052-41-3 | 500 | 2900 | - | | Stoddard solvent | https://referencesource.org/workplace-exposure-limits/stoddard-solvent/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 7789062 | null | strontium-chromate-as-cr-see-also-sections-1532-2-5206-8359-stearates-see-specif | 0.0005 | null | https://www.dir.ca.gov/title8/5155.html | 7789062 | | Strontium chromate, as Cr (see also Sections 1532.2, 5206 & 8359) Stearates; see specific compound | -- | 0.0005 | Strontium chromate, as Cr (see also Sections 1532.2, 5206 & 8359) Stearates; see specific compound | https://referencesource.org/workplace-exposure-limits/strontium-chromate-as-cr-see-also-sections-1532-2-5206-8359-stearates-see-specif/ | [
"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/npgd0570.html",
"source_quote": "NIOSH REL TWA 0.15 mg/m3",
"value": "TWA 0.15"
}
] | 57-24-9 | [] | strychnine | 0.15 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Strychnine | 57-24-9 | - | 0.15 | - | | Strychnine | https://referencesource.org/workplace-exposure-limits/strychnine/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
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