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_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0571.html",
"source_quote": "NIOSH REL TWA 50 ppm (215 mg/m3) ST 100 ppm (425 mg/m3)",
"value": "TWA 50"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https:/... | 100-42-5 | [] | styrene | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Styrene | 100-42-5 | - | (2) | - | | Styrene | https://referencesource.org/workplace-exposure-limits/styrene/ | [
"cas_number",
"substance"
] | null | null | null | null | null | null | null |
null | 1395-21-7 (BPN) 9014-01-1 (Carlsburg) | null | subtilisins | null | null | https://www.cdc.gov/niosh/npg/npgd0572.html | NIOSH REL ST 0.00006 mg/m3 [60-minute] | Subtilisins | https://referencesource.org/workplace-exposure-limits/subtilisins/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | ST 0.00006 | null | null | null | null | null |
null | 9014011 | null | subtilisins-as-pure-crystalline-proteolytic-enzymes | null | null | https://www.dir.ca.gov/title8/5155.html | 9014011 | | Subtilisins (as pure crystalline proteolytic enzymes) | -- | | | | 0.00006(r) | Subtilisins (as pure crystalline proteolytic enzymes) | https://referencesource.org/workplace-exposure-limits/subtilisins-as-pure-crystalline-proteolytic-enzymes/ | [
"cas_number",
"stel_mgm3",
"substance"
] | null | null | null | null | 0.00006(r) | null | null |
null | 110-61-2 | null | succinonitrile | null | null | https://www.cdc.gov/niosh/npg/npgd0573.html | NIOSH REL TWA 6 ppm (20 mg/m3) | Succinonitrile | https://referencesource.org/workplace-exposure-limits/succinonitrile/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 20 | TWA 6 | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_statement",
"source": "https://www.cdc.gov/niosh/npg/npgd0574.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)"
}
] | 57-50-1 | [] | sucrose | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Sucrose | 57-50-1 | - | - | - | | Sucrose | https://referencesource.org/workplace-exposure-limits/sucrose/ | [
"cas_number",
"substance"
] | null | null | null | null | null | null | null |
null | 74222972 | null | sulfometuron-methyl | 3.5 | null | https://www.dir.ca.gov/title8/5155.html | 74222972 | | Sulfometuron methyl | -- | 3.5 | Sulfometuron methyl | https://referencesource.org/workplace-exposure-limits/sulfometuron-methyl/ | [
"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/npgd0586.html",
"source_quote": "NIOSH REL TWA 0.2 mg/m3 [skin]",
"value": "TWA 0.2"
}
] | 3689245 | [] | sulfotep-tetraethyl-dithionopyrophosphate | 0.2 | null | https://www.dir.ca.gov/title8/5155.html | 3689245 | S | Sulfotep; tetraethyl dithionopyrophosphate | | 0.2 | Sulfotep; tetraethyl dithionopyrophosphate | https://referencesource.org/workplace-exposure-limits/sulfotep-tetraethyl-dithionopyrophosphate/ | [
"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": "7446095 | | Sulfur dioxide | 2 | 5 | | 5 | 10",
"value": "5"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "https://www.dir.ca.gov/t... | 7446-09-5 | [
{
"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": "Sulfur dioxide | 7446-09-5 | 5 | 13 | - |",
"value": "5"
},
{
"as_of":... | sulfur-dioxide | 13 | 5 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Sulfur dioxide | 7446-09-5 | 5 | 13 | - | | Sulfur dioxide | https://referencesource.org/workplace-exposure-limits/sulfur-dioxide/ | [
"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/npgd0576.html",
"source_quote": "NIOSH REL TWA 1000 ppm (6000 mg/m3)",
"value": "TWA 1000"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh... | 2551-62-4 | [] | sulfur-hexafluoride | 6000 | 1000 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Sulfur hexafluoride | 2551-62-4 | 1000 | 6000 | - | | Sulfur hexafluoride | https://referencesource.org/workplace-exposure-limits/sulfur-hexafluoride/ | [
"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/npgd0578.html",
"source_quote": "NIOSH REL C 1 ppm (6 mg/m3)",
"value": "C 1"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0578... | 10025-67-9 | [] | sulfur-monochloride | 6 | 1 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Sulfur monochloride | 10025-67-9 | 1 | 6 | - | | Sulfur monochloride | https://referencesource.org/workplace-exposure-limits/sulfur-monochloride/ | [
"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/npgd0579.html",
"source_quote": "NIOSH REL C 0.01 ppm (0.1 mg/m3)",
"value": "C 0.01"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/... | 5714-22-7 | [
{
"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": "Sulfur pentafluoride | 5714-22-7 | 0.025 | 0.25 | - |",
"value": "0.025"
},
{
... | sulfur-pentafluoride | 0.25 | 0.025 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Sulfur pentafluoride | 5714-22-7 | 0.025 | 0.25 | - | | Sulfur pentafluoride | https://referencesource.org/workplace-exposure-limits/sulfur-pentafluoride/ | [
"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/npgd0580.html",
"source_quote": "NIOSH REL C 0.1 ppm (0.4 mg/m3)",
"value": "C 0.1"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/np... | 7783600 | [] | sulfur-tetrafluoride | 0.4 | 0.1 | https://www.dir.ca.gov/title8/5155.html | 7783600 | | Sulfur tetrafluoride | 0.1 | 0.4 | C | Sulfur tetrafluoride | https://referencesource.org/workplace-exposure-limits/sulfur-tetrafluoride/ | [
"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": "stel_mgm3",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "7664939 | | Sulfuric acid | -- | 0.1 | | -- | 3",
"value": "3"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/ni... | 7664-93-9 | [
{
"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": "Sulfuric acid | 7664-93-9 | - | 1 | - |",
"value": "1"
},
{
"as_of": ... | sulfuric-acid | 1 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Sulfuric acid | 7664-93-9 | - | 1 | - | | Sulfuric acid | https://referencesource.org/workplace-exposure-limits/sulfuric-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/npgd0581.html",
"source_quote": "NIOSH REL TWA 5 ppm (20 mg/m3) ST 10 ppm (40 mg/m3)",
"value": "TWA 5"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.... | 2699-79-8 | [] | sulfuryl-fluoride | 20 | 5 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Sulfuryl fluoride | 2699-79-8 | 5 | 20 | - | | Sulfuryl fluoride | https://referencesource.org/workplace-exposure-limits/sulfuryl-fluoride/ | [
"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/npgd0582.html",
"source_quote": "NIOSH REL TWA 1 mg/m3",
"value": "TWA 1"
}
] | 35400432 | [] | sulprofos | 1 | null | https://www.dir.ca.gov/title8/5155.html | 35400432 | | Sulprofos | | 1 | Sulprofos | https://referencesource.org/workplace-exposure-limits/sulprofos/ | [
"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": "14807966 | | Talc (containing no asbestos fibers), respirable dust | -- | 2",
"value": "2"
}
] | 14807-96-6 | [] | talc-containing-no-asbestos-and-less-than-1-quartz | null | null | https://www.cdc.gov/niosh/npg/npgd0584.html | NIOSH REL TWA 2 mg/m3 (resp) | Talc (containing no asbestos and less than 1% quartz) | https://referencesource.org/workplace-exposure-limits/talc-containing-no-asbestos-and-less-than-1-quartz/ | [
"cas_number",
"rel_statement",
"substance"
] | TWA 2 mg/m3 (resp) | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0585.html",
"source_quote": "NIOSH REL TWA 5 mg/m3 ST 10 mg/m3",
"value": "TWA 5"
}
] | 7440-25-7 | [] | tantalum-metal-and-oxide-dust | 5 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Tantalum, metal and oxide dust | 7440-25-7 | - | 5 | - | | Tantalum, metal and oxide dust | https://referencesource.org/workplace-exposure-limits/tantalum-metal-and-oxide-dust/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 1314610 | null | tantalum-oxide-dust-as-ta | 5 | null | https://www.dir.ca.gov/title8/5155.html | 1314610 | | Tantalum oxide dust, as Ta | -- | 5 | Tantalum oxide dust, as Ta | https://referencesource.org/workplace-exposure-limits/tantalum-oxide-dust-as-ta/ | [
"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": "Tellurium and compounds (as Te) | 13494-80-9 | - | 0.1 | - |",
"value": "0.1"
}
] | 13494-80-9 | [] | tellurium | null | null | https://www.cdc.gov/niosh/npg/npgd0587.html | NIOSH REL TWA 0.1 mg/m3 | Tellurium | https://referencesource.org/workplace-exposure-limits/tellurium/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 0.1 | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0588.html",
"source_quote": "NIOSH REL TWA 0.02 ppm (0.2 mg/m3)",
"value": "TWA 0.02"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/... | 7783804 | [] | tellurium-hexafluoride | 0.2 | 0.02 | https://www.dir.ca.gov/title8/5155.html | 7783804 | | Tellurium hexafluoride | 0.02 | 0.2 | Tellurium hexafluoride | https://referencesource.org/workplace-exposure-limits/tellurium-hexafluoride/ | [
"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/npgd0589.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)"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "... | 3383-96-8 | [] | temephos | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Temephos | 3383-96-8 | - | - | - | | Temephos | https://referencesource.org/workplace-exposure-limits/temephos/ | [
"cas_number",
"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": "TEPP (Tetraethyl pyrophosphate) | 107-49-3 | - | 0.05 | X |",
"value": "0.05"
},
{
"as_of": "2026-08-05T00:00:00",
"fie... | 107-49-3 | [] | tepp | null | null | https://www.cdc.gov/niosh/npg/npgd0590.html | NIOSH REL TWA 0.05 mg/m3 [skin] | TEPP | https://referencesource.org/workplace-exposure-limits/tepp/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 0.05 | null | null | null | null | null |
null | 100210 | null | terephthalic-acid | 10 | null | https://www.dir.ca.gov/title8/5155.html | 100210 | | Terephthalic acid | -- | 10 | Terephthalic acid | https://referencesource.org/workplace-exposure-limits/terephthalic-acid/ | [
"cas_number",
"pel_mgm3",
"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": "Terphenyls | 0.5 | 5 | C",
"value": "the values given in the PEL columns are ceiling values"
}
] | 26140-60-3 | [
{
"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": "Terphenyls | 26140-60-3 | (C)1 | (C)9 | - |",
"value": "(C)1"
},
{
"as... | terphenyls | (C)9 | (C)1 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Terphenyls | 26140-60-3 | (C)1 | (C)9 | - | | Terphenyls | https://referencesource.org/workplace-exposure-limits/terphenyls/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 625161 | null | tert-amyl-acetate-see-pentyl-acetate | null | null | https://www.dir.ca.gov/title8/5155.html | 625161 | | tert-Amyl acetate; see Pentyl acetate | tert-Amyl acetate; see Pentyl acetate | https://referencesource.org/workplace-exposure-limits/tert-amyl-acetate-see-pentyl-acetate/ | [
"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/npgd0074.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... | 540-88-5 | [
{
"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": "tert-Butyl acetate | 540-88-5 | 200 | 950 | - |",
"value": "950"
},
{
... | tert-butyl-acetate | 950 | 200 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | tert-Butyl acetate | 540-88-5 | 200 | 950 | - | | tert-Butyl acetate | https://referencesource.org/workplace-exposure-limits/tert-butyl-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": "75650 | | tert-Butyl alcohol | 100 | 300 | | 150 | 450",
"value": "150"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "https://www.d... | 75-65-0 | [] | tert-butyl-alcohol | 300 | 100 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | tert-Butyl alcohol | 75-65-0 | 100 | 300 | - | | tert-Butyl alcohol | https://referencesource.org/workplace-exposure-limits/tert-butyl-alcohol/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | 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": "1189851 | S | tert-Butyl chromate; di-tert-butyl Chromate, as CrO$3 | -- | 0.1 | C",
"value": "0.1"
},
{
"as_of": "2026-09-28T00:00:00",
"field": "ceiling_nota... | 1189-85-1 | [] | tert-butyl-chromate | null | null | https://www.cdc.gov/niosh/npg/npgd0080.html | NIOSH REL Ca TWA 0.001 mg Cr(VI)/m3 See Appendix A See Appendix C | tert-Butyl chromate | https://referencesource.org/workplace-exposure-limits/tert-butyl-chromate/ | [
"cas_number",
"rel_statement",
"substance"
] | Ca TWA 0.001 mg Cr(VI)/m3 See Appendix A See Appendix C | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0600.html",
"source_quote": "NIOSH REL TWA 2 mg/m3 [skin]",
"value": "TWA 2"
}
] | 1335-88-2 | [] | tetrachloronaphthalene | 2 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Tetrachloronaphthalene | 1335-88-2 | - | 2 | X | | Tetrachloronaphthalene | https://referencesource.org/workplace-exposure-limits/tetrachloronaphthalene/ | [
"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/npgd0601.html",
"source_quote": "NIOSH REL TWA 0.075 mg/m3 [skin]",
"value": "TWA 0.075"
}
] | 78-00-2 | [] | tetraethyl-lead-as-pb | 0.075 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Tetraethyl lead (as Pb) | 78-00-2 | - | 0.075 | X | | Tetraethyl lead (as Pb) | https://referencesource.org/workplace-exposure-limits/tetraethyl-lead-as-pb/ | [
"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": "109999 | | Tetrahydrofuran | 200 | 590 | | 250 | 735",
"value": "250"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "https://www.dir... | 109-99-9 | [] | tetrahydrofuran | 590 | 200 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Tetrahydrofuran | 109-99-9 | 200 | 590 | - | | Tetrahydrofuran | https://referencesource.org/workplace-exposure-limits/tetrahydrofuran/ | [
"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/npgd0603.html",
"source_quote": "NIOSH REL TWA 0.075 mg/m3 [skin]",
"value": "TWA 0.075"
}
] | 75-74-1 | [] | tetramethyl-lead-as-pb | 0.075 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Tetramethyl lead (as Pb) | 75-74-1 | - | 0.075 | X | | Tetramethyl lead (as Pb) | https://referencesource.org/workplace-exposure-limits/tetramethyl-lead-as-pb/ | [
"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/npgd0604.html",
"source_quote": "NIOSH REL TWA 3 mg/m3 (0.5 ppm) [skin]",
"value": "0.5"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/n... | 3333-52-6 | [] | tetramethyl-succinonitrile | 3 | 0.5 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Tetramethyl succinonitrile | 3333-52-6 | 0.5 | 3 | X | | Tetramethyl succinonitrile | https://referencesource.org/workplace-exposure-limits/tetramethyl-succinonitrile/ | [
"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/npgd0605.html",
"source_quote": "NIOSH REL TWA 1 ppm (8 mg/m3)",
"value": "TWA 1"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd... | 509-14-8 | [
{
"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": "Tetranitromethane | 509-14-8 | 1 | 8 | - |",
"value": "1"
},
{
"as_of"... | tetranitromethane | 8 | 1 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Tetranitromethane | 509-14-8 | 1 | 8 | - | | Tetranitromethane | https://referencesource.org/workplace-exposure-limits/tetranitromethane/ | [
"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/npgd0606.html",
"source_quote": "NIOSH REL TWA 5 mg/m3",
"value": "TWA 5"
}
] | 7722885 | [] | tetrasodium-pyrophosphate | 5 | null | https://www.dir.ca.gov/title8/5155.html | 7722885 | | Tetrasodium pyrophosphate | -- | 5 | Tetrasodium pyrophosphate | https://referencesource.org/workplace-exposure-limits/tetrasodium-pyrophosphate/ | [
"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": "Tetryl (2,4,6-Trinitrophenylmethylnitramine) | 479-45-8 | - | 1.5 | X |",
"value": "1.5"
}
] | 479-45-8 | [] | tetryl | null | null | https://www.cdc.gov/niosh/npg/npgd0607.html | NIOSH REL TWA 1.5 mg/m3 [skin] | Tetryl | https://referencesource.org/workplace-exposure-limits/tetryl/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 1.5 | null | null | null | null | null |
null | 7440-28-0 | [] | thallium-soluble-compounds-as-tl | 0.1 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Thallium, soluble compounds (as Tl) | 7440-28-0 | - | 0.1 | X | | Thallium, soluble compounds (as Tl) | https://referencesource.org/workplace-exposure-limits/thallium-soluble-compounds-as-tl/ | [
"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/npgd0610.html",
"source_quote": "NIOSH REL TWA 1 ppm (4 mg/m3) [skin]",
"value": "TWA 1"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/n... | 68111 | [] | thioglycolic-acid | 3.8 | 1 | https://www.dir.ca.gov/title8/5155.html | 68111 | S | Thioglycolic acid | 1 | 3.8 | Thioglycolic acid | https://referencesource.org/workplace-exposure-limits/thioglycolic-acid/ | [
"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/npgd0611.html",
"source_quote": "NIOSH REL C 1 ppm (5 mg/m3)",
"value": "C 1"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0611... | 7719097 | [] | thionyl-chloride | 5 | 1 | https://www.dir.ca.gov/title8/5155.html | 7719097 | | Thionyl chloride | 1 | 5 | C | Thionyl chloride | https://referencesource.org/workplace-exposure-limits/thionyl-chloride/ | [
"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/npgd0612.html",
"source_quote": "NIOSH REL TWA 5 mg/m3",
"value": "TWA 5"
}
] | 137-26-8 | [] | thiram | 5 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Thiram | 137-26-8 | - | 5 | - | | Thiram | https://referencesource.org/workplace-exposure-limits/thiram/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 7440-31-5 | null | tin | null | null | https://www.cdc.gov/niosh/npg/npgd0613.html | NIOSH REL TWA 2 mg/m3 | Tin | https://referencesource.org/workplace-exposure-limits/tin/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 2 | 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": "21651194 | | Tin, tin oxide and inorganic compounds, except SnH $4, as Sn | -- | 2",
"value": "2"
}
] | 21651-19-4 | [] | tin-ii-oxide-as-sn | null | null | https://www.cdc.gov/niosh/npg/npgd0615.html | NIOSH REL TWA 2 mg/m3 | Tin(II) oxide (as Sn) | https://referencesource.org/workplace-exposure-limits/tin-ii-oxide-as-sn/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 2 | null | null | null | null | null |
null | 7440-31-5 | null | tin-inorganic-compounds-except-oxides-as-sn | 2 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Tin, inorganic compounds (except oxides) (as Sn) | 7440-31-5 | - | 2 | - | | Tin, inorganic compounds (except oxides) (as Sn) | https://referencesource.org/workplace-exposure-limits/tin-inorganic-compounds-except-oxides-as-sn/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 18282-10-5 | null | tin-iv-oxide-as-sn | null | null | https://www.cdc.gov/niosh/npg/npgd0616.html | NIOSH REL TWA 2 mg/m3 | Tin(IV) oxide (as Sn) | https://referencesource.org/workplace-exposure-limits/tin-iv-oxide-as-sn/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 2 | null | null | null | null | null |
[
{
"as_of": "2026-09-25T00:00:00",
"field": "stel_mgm3",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "S | Tin, organic compounds, as Sn | -- | 0.1 | | -- | 0.2",
"value": "0.2"
}
] | 7440-31-5 | [] | tin-organic-compounds-as-sn | 0.1 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Tin, organic compounds (as Sn) | 7440-31-5 | - | 0.1 | - | | Tin, organic compounds (as Sn) | https://referencesource.org/workplace-exposure-limits/tin-organic-compounds-as-sn/ | [
"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/npgd0617.html",
"source_quote": "NIOSH REL Ca See Appendix A",
"value": "Ca See Appendix A"
}
] | 13463-67-7 | [] | titanium-dioxide | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Titanium dioxide | 13463-67-7 | - | - | - | | Titanium dioxide | https://referencesource.org/workplace-exposure-limits/titanium-dioxide/ | [
"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/npgd0619.html",
"source_quote": "NIOSH REL TWA 100 ppm (375 mg/m3) ST 150 ppm (560 mg/m3)",
"value": "TWA 100"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https... | 108-88-3 | [] | toluene | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Toluene | 108-88-3 | - | (2) | - | | Toluene | https://referencesource.org/workplace-exposure-limits/toluene/ | [
"cas_number",
"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": "Toluene-2,4-diisocyanate (TDI) | 584-84-9 | (C)0.02 | (C)0.14 | - |",
"value": "(C)0.02"
},
{
"as_of": "2026-08-05T00:00:00"... | 584-84-9 | [] | toluene-2-4-diisocyanate | null | null | https://www.cdc.gov/niosh/npg/npgd0621.html | NIOSH REL Ca See Appendix A | Toluene-2,4-diisocyanate | https://referencesource.org/workplace-exposure-limits/toluene-2-4-diisocyanate/ | [
"cas_number",
"rel_statement",
"substance"
] | Ca See Appendix A | null | null | null | null | null | null |
null | 25376-45-8 95-80-7 (2,4-TDA) | null | toluenediamine | null | null | https://www.cdc.gov/niosh/npg/npgd0620.html | NIOSH REL Ca (all isomers) See Appendix A | Toluenediamine | https://referencesource.org/workplace-exposure-limits/toluenediamine/ | [
"cas_number",
"rel_statement",
"substance"
] | Ca (all isomers) See Appendix A | null | null | null | null | null | null |
null | null | null | tremolite-containing-no-asbestos-fibers-respirable-dust | 2 | null | https://www.dir.ca.gov/title8/5155.html | Tremolite (containing no asbestos fibers), respirable dust | -- | 2 | Tremolite (containing no asbestos fibers), respirable dust | https://referencesource.org/workplace-exposure-limits/tremolite-containing-no-asbestos-fibers-respirable-dust/ | [
"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": "126738 | | Tributyl phosphate | 0.2 | 2.5",
"value": "0.2"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg... | 126-73-8 | [
{
"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": "Tributyl phosphate | 126-73-8 | - | 5 | - |",
"value": "5"
},
{
"as_o... | tributyl-phosphate | 5 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Tributyl phosphate | 126-73-8 | - | 5 | - | | Tributyl phosphate | https://referencesource.org/workplace-exposure-limits/tributyl-phosphate/ | [
"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/npgd0626.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... | 76039 | [] | trichloroacetic-acid | 5 | 1 | https://www.dir.ca.gov/title8/5155.html | 76039 | | Trichloroacetic acid | 1 | 5 | Trichloroacetic acid | https://referencesource.org/workplace-exposure-limits/trichloroacetic-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/npgd0629.html",
"source_quote": "NIOSH REL Ca See Appendix A See Appendix C",
"value": "Ca See Appendix A See Appendix C"
},
{
"as_of": "2026-09-28T00:00:00",
"field": "pel_ppm",
... | 79-01-6 | [] | trichloroethylene | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Trichloroethylene | 79-01-6 | - | (2) | - | | Trichloroethylene | https://referencesource.org/workplace-exposure-limits/trichloroethylene/ | [
"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/npgd0630.html",
"source_quote": "NIOSH REL TWA 5 mg/m3 [skin]",
"value": "TWA 5"
}
] | 1321-65-9 | [] | trichloronaphthalene | 5 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Trichloronaphthalene | 1321-65-9 | - | 5 | X | | Trichloronaphthalene | https://referencesource.org/workplace-exposure-limits/trichloronaphthalene/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 15468323 | [] | tridymite | 0.05 | null | https://www.dir.ca.gov/title8/5155.html | 15468323 | | Tridymite, | -- | 0.05 | Tridymite, | https://referencesource.org/workplace-exposure-limits/tridymite/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 102716 | null | triethanolamine | 5 | null | https://www.dir.ca.gov/title8/5155.html | 102716 | | Triethanolamine | -- | 5 | Triethanolamine | https://referencesource.org/workplace-exposure-limits/triethanolamine/ | [
"cas_number",
"pel_mgm3",
"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": "121448 | S | Triethylamine | 1 | 4.1 | C",
"value": "the values given in the PEL columns are ceiling values"
},
{
"as_of": "2026-09-08T00:00:00",
"fiel... | 121-44-8 | [
{
"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": "Triethylamine | 121-44-8 | 25 | 100 | - |",
"value": "25"
},
{
"as_of"... | triethylamine | 100 | 25 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Triethylamine | 121-44-8 | 25 | 100 | - | | Triethylamine | https://referencesource.org/workplace-exposure-limits/triethylamine/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 112492 | null | triethylene-glycol-dimethyl-ether-triglyme | 36 | 5 | https://www.dir.ca.gov/title8/5155.html | 112492 | S | Triethylene glycol dimethyl ether, Triglyme | 5 | 36 | Triethylene glycol dimethyl ether, Triglyme | https://referencesource.org/workplace-exposure-limits/triethylene-glycol-dimethyl-ether-triglyme/ | [
"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/npgd0634.html",
"source_quote": "NIOSH REL TWA 1000 ppm (6100 mg/m3)",
"value": "TWA 1000"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh... | 75-63-8 | [] | trifluorobromomethane | 6100 | 1000 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Trifluorobromomethane | 75-63-8 | 1000 | 6100 | - | | Trifluorobromomethane | https://referencesource.org/workplace-exposure-limits/trifluorobromomethane/ | [
"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/npgd0635.html",
"source_quote": "NIOSH REL TWA 0.005 ppm (0.04 mg/m3) Should be handled in the workplace as an extremely toxic substance",
"value": "TWA 0.005"
},
{
"as_of": "2026-09-08T00:00:0... | 552307 | [] | trimellitic-anhydride | 0.04 | 0.005 | https://www.dir.ca.gov/title8/5155.html | 552307 | | Trimellitic anhydride | 0.005 | 0.04 | C | Trimellitic anhydride | https://referencesource.org/workplace-exposure-limits/trimellitic-anhydride/ | [
"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/npgd0640.html",
"source_quote": "NIOSH REL TWA 2 ppm (10 mg/m3)",
"value": "TWA 2"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npg... | 121459 | [] | trimethyl-phosphite | 10 | 2 | https://www.dir.ca.gov/title8/5155.html | 121459 | | Trimethyl phosphite | 2 | 10 | Trimethyl phosphite | https://referencesource.org/workplace-exposure-limits/trimethyl-phosphite/ | [
"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/npgd0636.html",
"source_quote": "NIOSH REL TWA 10 ppm (24 mg/m3) ST 15 ppm (36 mg/m3)",
"value": "TWA 10"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://ww... | 75503 | [] | trimethylamine | 12 | 5 | https://www.dir.ca.gov/title8/5155.html | 75503 | | Trimethylamine | 5 | 12 | | 15 | 36 | Trimethylamine | https://referencesource.org/workplace-exposure-limits/trimethylamine/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"stel_mgm3",
"stel_ppm",
"substance"
] | null | null | null | null | 36 | 15 | null |
null | null | null | trimethylbenzene-all-isomers | 125 | 25 | https://www.dir.ca.gov/title8/5155.html | Trimethylbenzene, all isomers | 25 | 125 | Trimethylbenzene, all isomers | https://referencesource.org/workplace-exposure-limits/trimethylbenzene-all-isomers/ | [
"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/npgd0642.html",
"source_quote": "NIOSH REL TWA 0.1 mg/m3 [skin]",
"value": "TWA 0.1"
}
] | 78-30-8 | [] | triorthocresyl-phosphate | 0.1 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Triorthocresyl phosphate | 78-30-8 | - | 0.1 | - | | Triorthocresyl phosphate | https://referencesource.org/workplace-exposure-limits/triorthocresyl-phosphate/ | [
"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/npgd0644.html",
"source_quote": "NIOSH REL TWA 3 mg/m3",
"value": "TWA 3"
}
] | 115-86-6 | [] | triphenyl-phosphate | 3 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Triphenyl phosphate | 115-86-6 | - | 3 | - | | Triphenyl phosphate | https://referencesource.org/workplace-exposure-limits/triphenyl-phosphate/ | [
"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/npgd0643.html",
"source_quote": "NIOSH REL TWA 5 mg/m3",
"value": "TWA 5"
}
] | 603349 | [] | triphenylamine | 5 | null | https://www.dir.ca.gov/title8/5155.html | 603349 | | Triphenylamine | -- | 5 | Triphenylamine | https://referencesource.org/workplace-exposure-limits/triphenylamine/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 1317959 | [] | tripoli-as-quartz | 0.05 | null | https://www.dir.ca.gov/title8/5155.html | 1317959 | | Tripoli, (as quartz) | -- | 0.05 | Tripoli, (as quartz) | https://referencesource.org/workplace-exposure-limits/tripoli-as-quartz/ | [
"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": "7440337 | | Tungsten metal, as W | -- | 5",
"value": "5"
}
] | 7440-33-7 | [] | tungsten | null | null | https://www.cdc.gov/niosh/npg/npgd0645.html | NIOSH REL TWA 5 mg/m3 ST 10 mg/m3 | Tungsten | https://referencesource.org/workplace-exposure-limits/tungsten/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 5 | null | null | null | null | null |
null | 1: 11107-01-0 2: 12718-69-3 3: 37329-49-0 | null | tungsten-carbide-cemented | null | null | https://www.cdc.gov/niosh/npg/npgd0647.html | NIOSH REL See Appendix C | Tungsten carbide (cemented) | https://referencesource.org/workplace-exposure-limits/tungsten-carbide-cemented/ | [
"cas_number",
"rel_statement",
"substance"
] | See Appendix C | null | null | null | null | null | null |
null | null | null | tungsten-insoluble-compounds-as-w | 5 | null | https://www.dir.ca.gov/title8/5155.html | Tungsten, insoluble compounds, as W | -- | 5 | | -- | 10 | Tungsten, insoluble compounds, as W | https://referencesource.org/workplace-exposure-limits/tungsten-insoluble-compounds-as-w/ | [
"pel_mgm3",
"stel_mgm3",
"substance"
] | null | null | null | null | 10 | null | null |
null | null | null | tungsten-soluble-compounds-as-w | 1 | null | https://www.dir.ca.gov/title8/5155.html | Tungsten, soluble compounds, as W | -- | 1 | | -- | 3 | Tungsten, soluble compounds, as W | https://referencesource.org/workplace-exposure-limits/tungsten-soluble-compounds-as-w/ | [
"pel_mgm3",
"stel_mgm3",
"substance"
] | null | null | null | null | 3 | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0648.html",
"source_quote": "NIOSH REL TWA 100 ppm (560 mg/m3)",
"value": "TWA 100"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/np... | 8006-64-2 | [] | turpentine | 560 | 100 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Turpentine | 8006-64-2 | 100 | 560 | - | | Turpentine | https://referencesource.org/workplace-exposure-limits/turpentine/ | [
"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/npgd0650.html",
"source_quote": "NIOSH REL Ca TWA 0.2 mg/m3 ST 0.6 mg/m3",
"value": "TWA 0.2"
}
] | 7440-61-1 | [] | uranium-as-u | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Uranium (as U) | 7440-61-1 | - | - | - | | Uranium (as U) | https://referencesource.org/workplace-exposure-limits/uranium-as-u/ | [
"cas_number",
"substance"
] | null | null | null | null | null | null | null |
null | null | null | uranium-natural-insoluble-compounds-as-u | 0.2 | null | https://www.dir.ca.gov/title8/5155.html | Uranium (natural), insoluble compounds, as U | -- | 0.2 | | -- | 0.6 | Uranium (natural), insoluble compounds, as U | https://referencesource.org/workplace-exposure-limits/uranium-natural-insoluble-compounds-as-u/ | [
"pel_mgm3",
"stel_mgm3",
"substance"
] | null | null | null | null | 0.6 | null | null |
null | null | null | uranium-natural-soluble-compounds-as-u | 0.05 | null | https://www.dir.ca.gov/title8/5155.html | Uranium (natural), soluble compounds, as U | -- | 0.05 | Uranium (natural), soluble compounds, as U | https://referencesource.org/workplace-exposure-limits/uranium-natural-soluble-compounds-as-u/ | [
"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/npgd0653.html",
"source_quote": "NIOSH REL C 0.05 mg V/m3 [15-minute]",
"value": "C 0.05 mg V/m3 [15-minute]"
},
{
"as_of": "2026-09-25T00:00:00",
"field": "pel_mgm3",
"source": "... | 1314-62-1 | [] | vanadium | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Vanadium | 1314-62-1 | - | - | - | | Vanadium | https://referencesource.org/workplace-exposure-limits/vanadium/ | [
"cas_number",
"substance"
] | null | null | null | null | null | null | null |
null | 68956-68-3 | null | vegetable-oil-mist | null | null | https://www.cdc.gov/niosh/npg/npgd0655.html | NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp) | Vegetable oil mist | https://referencesource.org/workplace-exposure-limits/vegetable-oil-mist/ | [
"cas_number",
"rel_statement",
"substance"
] | TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp) | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0656.html",
"source_quote": "NIOSH REL C 4 ppm (15 mg/m3) [15-minute]",
"value": "C 4"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh... | 108054 | [] | vinyl-acetate | 30 | 10 | https://www.dir.ca.gov/title8/5155.html | 108054 | | Vinyl acetate | 10 | 30 | | 15 | 45 | Vinyl acetate | https://referencesource.org/workplace-exposure-limits/vinyl-acetate/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"stel_mgm3",
"stel_ppm",
"substance"
] | null | null | null | null | 45 | 15 | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_ppm",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "593602 | | Vinyl bromide; bromoethylene | 0.1 | 0.44",
"value": "0.1"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",
"source": "https://www.dir.c... | 593-60-2 | [] | vinyl-bromide | null | null | https://www.cdc.gov/niosh/npg/npgd0657.html | NIOSH REL Ca See Appendix A | Vinyl bromide | https://referencesource.org/workplace-exposure-limits/vinyl-bromide/ | [
"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": "75014 | S | Vinyl chloride, see Section 5210 | 1",
"value": "1"
}
] | 75-01-4 | [] | vinyl-chloride | null | null | https://www.cdc.gov/niosh/npg/npgd0658.html | NIOSH REL Ca See Appendix A | Vinyl chloride | https://referencesource.org/workplace-exposure-limits/vinyl-chloride/ | [
"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/npgd0659.html",
"source_quote": "NIOSH REL Ca TWA 10 ppm (60 mg/m3) [skin]",
"value": "TWA 10"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/n... | 106876 | [] | vinyl-cyclohexene-dioxide | 0.57 | 0.1 | https://www.dir.ca.gov/title8/5155.html | 106876 | S | Vinyl cyclohexene dioxide | 0.1 | 0.57 | Vinyl cyclohexene dioxide | https://referencesource.org/workplace-exposure-limits/vinyl-cyclohexene-dioxide/ | [
"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/npgd0660.html",
"source_quote": "NIOSH REL TWA 1 ppm C 5 ppm [use 1910.1017]",
"value": "TWA 1"
}
] | 75025 | [] | vinyl-fluoride | 0.38 | 0.2 | https://www.dir.ca.gov/title8/5155.html | 75025 | | Vinyl fluoride | 0.2 | 0.38 | Vinyl fluoride | https://referencesource.org/workplace-exposure-limits/vinyl-fluoride/ | [
"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/npgd0663.html",
"source_quote": "NIOSH REL TWA 100 ppm (480 mg/m3)",
"value": "TWA 100"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/np... | 25013-15-4 | [
{
"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": "Vinyl toluene | 25013-15-4 | 100 | 480 | - |",
"value": "100"
},
{
"as... | vinyl-toluene | 480 | 100 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Vinyl toluene | 25013-15-4 | 100 | 480 | - | | Vinyl toluene | https://referencesource.org/workplace-exposure-limits/vinyl-toluene/ | [
"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": "75354 | | Vinylidene chloride; 1,1-dichloroethylene | 1 | 4",
"value": "1"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",
"source": "https://www.... | 75-35-4 | [] | vinylidene-chloride | null | null | https://www.cdc.gov/niosh/npg/npgd0661.html | NIOSH REL Ca See Appendix A | Vinylidene chloride | https://referencesource.org/workplace-exposure-limits/vinylidene-chloride/ | [
"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/npgd0662.html",
"source_quote": "NIOSH REL TWA 1 ppm C 5 ppm [use 1910.1017]",
"value": "TWA 1"
}
] | 75387 | [] | vinylidene-fluoride | 262 | 100 | https://www.dir.ca.gov/title8/5155.html | 75387 | | Vinylidene fluoride | 100 | 262 | Vinylidene fluoride | https://referencesource.org/workplace-exposure-limits/vinylidene-fluoride/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 8032-32-4 | null | vm-p-naphtha | null | null | https://www.cdc.gov/niosh/npg/npgd0664.html | NIOSH REL TWA 350 mg/m3 C 1800 mg/m3 [15-minute] | VM & P Naphtha | https://referencesource.org/workplace-exposure-limits/vm-p-naphtha/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 350 | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0665.html",
"source_quote": "NIOSH REL TWA 0.1 mg/m3",
"value": "TWA 0.1"
}
] | 81-81-2 | [] | warfarin | 0.1 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Warfarin | 81-81-2 | - | 0.1 | - | | Warfarin | https://referencesource.org/workplace-exposure-limits/warfarin/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | null | null | welding-fumes-total-particulates-see-also-individual-constituents | 5 | null | https://www.dir.ca.gov/title8/5155.html | Welding fumes; total particulates (see also individual constituents) | -- | 5 | Welding fumes; total particulates (see also individual constituents) | https://referencesource.org/workplace-exposure-limits/welding-fumes-total-particulates-see-also-individual-constituents/ | [
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | null | null | wood-dust-western-red-cedar | 0.5 | null | https://www.dir.ca.gov/title8/5155.html | Wood dust, Western red cedar | -- | 0.5 | Wood dust, Western red cedar | https://referencesource.org/workplace-exposure-limits/wood-dust-western-red-cedar/ | [
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 1330207 | [] | xylene-xylol-dimethylbenzene | 435 | 100 | https://www.dir.ca.gov/title8/5155.html | 1330207 | | Xylene; xylol; dimethylbenzene | 100 | 435 | 300 ppm | 150 | 655 | Xylene; xylol; dimethylbenzene | https://referencesource.org/workplace-exposure-limits/xylene-xylol-dimethylbenzene/ | [
"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 | 655 | 150 | 300 ppm |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0672.html",
"source_quote": "NIOSH REL TWA 2 ppm (10 mg/m3) [skin]",
"value": "TWA 2"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/... | 1300-73-8 | [
{
"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": "Xylidine | 1300-73-8 | 5 | 25 | X |",
"value": "5"
},
{
"as_of": "2026... | xylidine | 25 | 5 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Xylidine | 1300-73-8 | 5 | 25 | X | | Xylidine | https://referencesource.org/workplace-exposure-limits/xylidine/ | [
"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/npgd0673.html",
"source_quote": "NIOSH REL TWA 1 mg/m3",
"value": "TWA 1"
}
] | 7440-65-5 | [] | yttrium | 1 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Yttrium | 7440-65-5 | - | 1 | - | | Yttrium | https://referencesource.org/workplace-exposure-limits/yttrium/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | null | null | yttrium-compounds-as-y | 1 | null | https://www.dir.ca.gov/title8/5155.html | Yttrium compounds, as Y | -- | 1 | Yttrium compounds, as Y | https://referencesource.org/workplace-exposure-limits/yttrium-compounds-as-y/ | [
"pel_mgm3",
"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": "7646857 | | Zinc chloride fume | -- | 1 | | -- | 2",
"value": "2"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov... | 7646-85-7 | [] | zinc-chloride-fume | 1 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Zinc chloride fume | 7646-85-7 | - | 1 | - | | Zinc chloride fume | https://referencesource.org/workplace-exposure-limits/zinc-chloride-fume/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 13530659 | null | zinc-chromate-as-cr | 0.005 | null | https://www.dir.ca.gov/title8/5155.html | 13530659 | | Zinc chromate, as Cr | -- | 0.005 | Zinc chromate, as Cr | https://referencesource.org/workplace-exposure-limits/zinc-chromate-as-cr/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 15930946 | null | zinc-chromate-hydroxide-as-cr | 0.005 | null | https://www.dir.ca.gov/title8/5155.html | 15930946 | | Zinc chromate hydroxide, as Cr | -- | 0.005 | Zinc chromate hydroxide, as Cr | https://referencesource.org/workplace-exposure-limits/zinc-chromate-hydroxide-as-cr/ | [
"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/npgd0675.html",
"source_quote": "NIOSH REL Dust: TWA 5 mg/m3 C 15 mg/m3 Fume: TWA 5 mg/m3 ST 10 mg/m3",
"value": "Dust: TWA 5 mg/m3 C 15 mg/m3 Fume: TWA 5 mg/m3 ST 10 mg/m3"
}
] | 1314-13-2 | [] | zinc-oxide | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Zinc oxide | 1314-13-2 | - | - | - | | Zinc oxide | https://referencesource.org/workplace-exposure-limits/zinc-oxide/ | [
"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": "1314132 | | Zinc oxide fume | -- | 5 | | -- | 10",
"value": "10"
}
] | 1314-13-2 | [] | zinc-oxide-fume | 5 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Zinc oxide fume | 1314-13-2 | - | 5 | - | | Zinc oxide fume | https://referencesource.org/workplace-exposure-limits/zinc-oxide-fume/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 11103869 | null | zinc-potassium-chromate-as-cr | 0.005 | null | https://www.dir.ca.gov/title8/5155.html | 11103869 | | Zinc potassium chromate, as Cr | -- | 0.005 | Zinc potassium chromate, as Cr | https://referencesource.org/workplace-exposure-limits/zinc-potassium-chromate-as-cr/ | [
"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": "557051 | | Zinc stearate | -- | 10",
"value": "10"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_statement",
"source": "https://www.cdc.gov/niosh/npg/... | 557-05-1 | [] | zinc-stearate | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Zinc stearate | 557-05-1 | - | - | - | | Zinc stearate | https://referencesource.org/workplace-exposure-limits/zinc-stearate/ | [
"cas_number",
"substance"
] | null | null | null | null | null | null | null |
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