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_statement",
"source": "https://www.cdc.gov/niosh/npg/npgd0021.html",
"source_quote": "NIOSH REL See Appendix D",
"value": "See Appendix D"
}
] | 1344-28-1 | [] | alpha-alumina | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | alpha-Alumina | 1344-28-1 | - | - | - | | alpha-Alumina | https://referencesource.org/workplace-exposure-limits/alpha-alumina/ | [
"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/npgd0429.html",
"source_quote": "NIOSH REL TWA 50 ppm (240 mg/m3) ST 100 ppm (485 mg/m3)",
"value": "TWA 50"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https:/... | 98-83-9 | [
{
"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": "alpha-Methyl styrene | 98-83-9 | (C)100 | (C)480 | - |",
"value": "(C)100"
},
... | alpha-methyl-styrene | (C)480 | (C)100 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | alpha-Methyl styrene | 98-83-9 | (C)100 | (C)480 | - | | alpha-Methyl styrene | https://referencesource.org/workplace-exposure-limits/alpha-methyl-styrene/ | [
"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/npgd0395.html",
"source_quote": "NIOSH REL TWA 1 ppm (3 mg/m³) [skin]",
"value": "TWA 1"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/n... | 126987 | [] | alpha-methylacrylonitrile | 3 | 1 | https://www.dir.ca.gov/title8/5155.html | 126987 | S | alpha-Methylacrylonitrile | 1 | 3 | alpha-Methylacrylonitrile | https://referencesource.org/workplace-exposure-limits/alpha-methylacrylonitrile/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 134-32-7 | [] | alpha-naphthylamine | null | null | https://www.cdc.gov/niosh/npg/npgd0441.html | NIOSH REL Ca See Appendix A | alpha-Naphthylamine | https://referencesource.org/workplace-exposure-limits/alpha-naphthylamine/ | [
"cas_number",
"rel_statement",
"substance"
] | Ca See Appendix A | null | null | null | null | null | null |
null | 7429-90-5 | [] | aluminum | null | null | https://www.cdc.gov/niosh/npg/npgd0022.html | NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp) | Aluminum | https://referencesource.org/workplace-exposure-limits/aluminum/ | [
"cas_number",
"rel_statement",
"substance"
] | TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp) | null | null | null | null | null | null |
null | null | null | aluminum-alkyls-not-otherwise-classified | 2 | null | https://www.dir.ca.gov/title8/5155.html | Aluminum, alkyls (not otherwise classified) | -- | 2 | Aluminum, alkyls (not otherwise classified) | https://referencesource.org/workplace-exposure-limits/aluminum-alkyls-not-otherwise-classified/ | [
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 300925 | null | aluminum-distearate | 10 | null | https://www.dir.ca.gov/title8/5155.html | 300925 | | Aluminum distearate | -- | 10 | Aluminum distearate | https://referencesource.org/workplace-exposure-limits/aluminum-distearate/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | null | null | aluminum-pyro-powders | 5 | null | https://www.dir.ca.gov/title8/5155.html | Aluminum pyro powders | -- | 5 | Aluminum pyro powders | https://referencesource.org/workplace-exposure-limits/aluminum-pyro-powders/ | [
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | null | null | aluminum-soluble-salts | 2 | null | https://www.dir.ca.gov/title8/5155.html | Aluminum soluble salts | -- | 2 | Aluminum soluble salts | https://referencesource.org/workplace-exposure-limits/aluminum-soluble-salts/ | [
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 7047849 | null | aluminum-stearate | 10 | null | https://www.dir.ca.gov/title8/5155.html | 7047849 | | Aluminum stearate | -- | 10 | Aluminum stearate | https://referencesource.org/workplace-exposure-limits/aluminum-stearate/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 637127 | null | aluminum-tristearate | 10 | null | https://www.dir.ca.gov/title8/5155.html | 637127 | | Aluminum tristearate | -- | 10 | Aluminum tristearate | https://referencesource.org/workplace-exposure-limits/aluminum-tristearate/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | null | null | aluminum-welding-fumes | 5 | null | https://www.dir.ca.gov/title8/5155.html | Aluminum welding fumes | -- | 5 | Aluminum welding fumes | https://referencesource.org/workplace-exposure-limits/aluminum-welding-fumes/ | [
"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/npgd0027.html",
"source_quote": "NIOSH REL Ca TWA 0.2 mg/m3",
"value": "TWA 0.2"
}
] | 61825 | [] | amitrole | 0.2 | null | https://www.dir.ca.gov/title8/5155.html | 61825 | | Amitrole | -- | 0.2 | Amitrole | https://referencesource.org/workplace-exposure-limits/amitrole/ | [
"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": "7664417 | | Ammonia | 25 | 18 | | 35 | 27",
"value": "35"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "https://www.dir.ca.gov/titl... | 7664-41-7 | [
{
"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": "Ammonia | 7664-41-7 | 50 | 35 | - |",
"value": "50"
},
{
"as_of": "202... | ammonia | 35 | 50 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Ammonia | 7664-41-7 | 50 | 35 | - | | Ammonia | https://referencesource.org/workplace-exposure-limits/ammonia/ | [
"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/npgd0029.html",
"source_quote": "NIOSH REL TWA 10 mg/m3 ST 20 mg/m3",
"value": "TWA 10"
}
] | 12125029 | [] | ammonium-chloride-fume | 10 | null | https://www.dir.ca.gov/title8/5155.html | 12125029 | | Ammonium chloride fume | -- | 10 | | -- | 20 | Ammonium chloride fume | https://referencesource.org/workplace-exposure-limits/ammonium-chloride-fume/ | [
"cas_number",
"pel_mgm3",
"stel_mgm3",
"substance"
] | null | null | null | null | 20 | null | null |
null | 3825261 | null | ammonium-perfluorooctanoate | 0.01 | null | https://www.dir.ca.gov/title8/5155.html | 3825261 | S | Ammonium perfluorooctanoate | -- | 0.01 | Ammonium perfluorooctanoate | https://referencesource.org/workplace-exposure-limits/ammonium-perfluorooctanoate/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 1002897 | null | ammonium-stearate | 10 | null | https://www.dir.ca.gov/title8/5155.html | 1002897 | | Ammonium stearate | -- | 10 | Ammonium stearate | https://referencesource.org/workplace-exposure-limits/ammonium-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/npgd0030.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)"
}
] | 7773-06-0 | [] | ammonium-sulfamate | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Ammonium sulfamate | 7773-06-0 | - | - | - | | Ammonium sulfamate | https://referencesource.org/workplace-exposure-limits/ammonium-sulfamate/ | [
"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/npgd0033.html",
"source_quote": "NIOSH REL Ca See Appendix A",
"value": "Ca See Appendix A"
}
] | 62533 | [
{
"field": "pel_ppm",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "62533 | S | Aniline | 2 | 7.6",
"value": "2"
},
{
"as_of": "2026-08-05T00:00:00",
"source": "https://w... | aniline | 7.6 | 2 | https://www.dir.ca.gov/title8/5155.html | 62533 | S | Aniline | 2 | 7.6 | Aniline | https://referencesource.org/workplace-exposure-limits/aniline/ | [
"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": "29191524 | S | Anisidine (ortho and para isomers) | 0.1 | 0.5",
"value": "0.1"
}
] | 29191-52-4 | [] | anisidine-o-p-isomers | 0.5 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Anisidine (o-, p-isomers) | 29191-52-4 | - | 0.5 | X | | Anisidine (o-, p-isomers) | https://referencesource.org/workplace-exposure-limits/anisidine-o-p-isomers/ | [
"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": "Antimony and compounds (as Sb) | 7440-36-0 | - | 0.5 | - |",
"value": "0.5"
}
] | 7440-36-0 | [] | antimony | null | null | https://www.cdc.gov/niosh/npg/npgd0036.html | NIOSH REL TWA 0.5 mg/m3 | Antimony | https://referencesource.org/workplace-exposure-limits/antimony/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 0.5 | 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": "86884 | | ANTU; 1-(1-naphthyl)-2-thiourea; Bantu; Rattrack | -- | 0.3",
"value": "0.3"
}
] | 86-88-4 | [] | antu | null | null | https://www.cdc.gov/niosh/npg/npgd0037.html | NIOSH REL TWA 0.3 mg/m3 | ANTU | https://referencesource.org/workplace-exposure-limits/antu/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 0.3 | null | null | null | null | null |
null | 7440371 | null | argon | null | null | https://www.dir.ca.gov/title8/5155.html | 7440371 | | Argon | (h) | Argon | https://referencesource.org/workplace-exposure-limits/argon/ | [
"cas_number",
"substance"
] | null | null | null | null | null | null | null |
null | 7440382 | null | arsenic-and-inorganic-arsenic-compounds-see-also-section-5214 | 0.01 | null | https://www.dir.ca.gov/title8/5155.html | 7440382 | | Arsenic and inorganic arsenic compounds; see also Section 5214 | | 0.01 | Arsenic and inorganic arsenic compounds; see also Section 5214 | https://referencesource.org/workplace-exposure-limits/arsenic-and-inorganic-arsenic-compounds-see-also-section-5214/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 7440-38-2 (metal) | null | arsenic-inorganic-compounds-as-as | null | null | https://www.cdc.gov/niosh/npg/npgd0038.html | NIOSH REL Ca C 0.002 mg/m3 [15-minute] | Arsenic (inorganic compounds, as As) | https://referencesource.org/workplace-exposure-limits/arsenic-inorganic-compounds-as-as/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | C 0.002 | null | null | null | null | null |
null | 7440-38-2 | null | arsenic-inorganic-compounds-as-as-see-1910-1018 | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Arsenic, inorganic compounds (as As); see 1910.1018 | 7440-38-2 | - | - | - | | Arsenic, inorganic compounds (as As); see 1910.1018 | https://referencesource.org/workplace-exposure-limits/arsenic-inorganic-compounds-as-as-see-1910-1018/ | [
"cas_number",
"substance"
] | null | null | null | null | null | null | null |
null | 7440-38-2 | [
{
"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": "Arsenic, organic compounds (as As) | 7440-38-2 | - | 0.5 | - |",
"value": "0.5"
},
... | arsenic-organic-compounds-as-as | 0.5 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Arsenic, organic compounds (as As) | 7440-38-2 | - | 0.5 | - | | Arsenic, organic compounds (as As) | https://referencesource.org/workplace-exposure-limits/arsenic-organic-compounds-as-as/ | [
"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/npgd0040.html",
"source_quote": "NIOSH REL Ca C 0.002 mg/m3 [15-minute]",
"value": "C 0.002"
}
] | 7784-42-1 | [] | arsine | 0.2 | 0.05 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Arsine | 7784-42-1 | 0.05 | 0.2 | - | | Arsine | https://referencesource.org/workplace-exposure-limits/arsine/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 1332-21-4 | [] | asbestos | null | null | https://www.cdc.gov/niosh/npg/npgd0041.html | NIOSH REL Ca See Appendix A See Appendix C | Asbestos | https://referencesource.org/workplace-exposure-limits/asbestos/ | [
"cas_number",
"rel_statement",
"substance"
] | Ca See Appendix A See Appendix C | 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": "8052424 | | Asphalt (petroleum) fumes | -- | 5",
"value": "5"
}
] | 8052-42-4 | [] | asphalt-fumes | null | null | https://www.cdc.gov/niosh/npg/npgd0042.html | NIOSH REL Ca C 5 mg/m3 [15-minute] | Asphalt fumes | https://referencesource.org/workplace-exposure-limits/asphalt-fumes/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | C 5 | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0043.html",
"source_quote": "NIOSH REL TWA 5 mg/m3",
"value": "TWA 5"
}
] | 1912249 | [] | atrazine | 5 | null | https://www.dir.ca.gov/title8/5155.html | 1912249 | | Atrazine | -- | 5 | Atrazine | https://referencesource.org/workplace-exposure-limits/atrazine/ | [
"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/npgd0681.html",
"source_quote": "NIOSH REL TWA 0.2 mg/m3 [skin]",
"value": "TWA 0.2"
}
] | 86-50-0 | [] | azinphos-methyl | 0.2 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Azinphos-methyl | 86-50-0 | - | 0.2 | X | | Azinphos-methyl | https://referencesource.org/workplace-exposure-limits/azinphos-methyl/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 10361-37-2 | null | barium-chloride-as-ba | null | null | https://www.cdc.gov/niosh/npg/npgd0045.html | NIOSH REL TWA 0.5 mg/m3 | Barium chloride (as Ba) | https://referencesource.org/workplace-exposure-limits/barium-chloride-as-ba/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 0.5 | null | null | null | null | null |
null | 10022-31-8 | null | barium-nitrate-as-ba | null | null | https://www.cdc.gov/niosh/npg/npgd0046.html | NIOSH REL TWA 0.5 mg/m3 | Barium nitrate (as Ba) | https://referencesource.org/workplace-exposure-limits/barium-nitrate-as-ba/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 0.5 | null | null | null | null | null |
null | 7440-39-3 | [] | barium-soluble-compounds-as-ba | 0.5 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Barium, soluble compounds (as Ba) | 7440-39-3 | - | 0.5 | - | | Barium, soluble compounds (as Ba) | https://referencesource.org/workplace-exposure-limits/barium-soluble-compounds-as-ba/ | [
"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/npgd0047.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)"
}
] | 7727-43-7 | [] | barium-sulfate | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Barium sulfate | 7727-43-7 | - | - | - | | Barium sulfate | https://referencesource.org/workplace-exposure-limits/barium-sulfate/ | [
"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/npgd0048.html",
"source_quote": "NIOSH REL See Appendix D",
"value": "See Appendix D"
}
] | 17804-35-2 | [] | benomyl | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Benomyl | 17804-35-2 | - | - | - | | Benomyl | https://referencesource.org/workplace-exposure-limits/benomyl/ | [
"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": "71432 | S | Benzene; see also Section 5218 | 1 | | | 5 | --",
"value": "1"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_ppm",
"source": "https://www.... | 71-43-2 | [] | benzene | null | null | https://www.cdc.gov/niosh/npg/npgd0049.html | NIOSH REL Ca TWA 0.1 ppm ST 1 ppm | Benzene | https://referencesource.org/workplace-exposure-limits/benzene/ | [
"cas_number",
"rel_ppm",
"substance"
] | null | null | TWA 0.1 | 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": "108985 | | Phenyl mercaptan | 0.5 | 2",
"value": "0.5"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",
"source": "https://www.dir.ca.gov/title8/51... | 108-98-5 | [] | benzenethiol | null | null | https://www.cdc.gov/niosh/npg/npgd0050.html | NIOSH REL C 0.1 ppm (0.5 mg/m3) [15-minute] | Benzenethiol | https://referencesource.org/workplace-exposure-limits/benzenethiol/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 0.5 | C 0.1 | null | null | null | null |
null | 92-87-5 | [] | benzidine | null | null | https://www.cdc.gov/niosh/npg/npgd0051.html | NIOSH REL Ca See Appendix A See Appendix C | Benzidine | https://referencesource.org/workplace-exposure-limits/benzidine/ | [
"cas_number",
"rel_statement",
"substance"
] | Ca See Appendix A See Appendix C | null | null | null | null | null | null |
null | 98884 | null | benzoyl-chloride | 1.1 | 0.2 | https://www.dir.ca.gov/title8/5155.html | 98884 | | Benzoyl chloride | 0.2 | 1.1 | C | Benzoyl chloride | https://referencesource.org/workplace-exposure-limits/benzoyl-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/npgd0052.html",
"source_quote": "NIOSH REL TWA 5 mg/m3",
"value": "TWA 5"
}
] | 94-36-0 | [] | benzoyl-peroxide | 5 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Benzoyl peroxide | 94-36-0 | - | 5 | - | | Benzoyl peroxide | https://referencesource.org/workplace-exposure-limits/benzoyl-peroxide/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 140114 | null | benzyl-acetate | 61 | 10 | https://www.dir.ca.gov/title8/5155.html | 140114 | | Benzyl acetate | 10 | 61 | Benzyl acetate | https://referencesource.org/workplace-exposure-limits/benzyl-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/npgd0053.html",
"source_quote": "NIOSH REL C 1 ppm (5 mg/m3) [15-minute]",
"value": "C 1"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/... | 100-44-7 | [
{
"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": "Benzyl chloride | 100-44-7 | 1 | 5 | - |",
"value": "1"
},
{
"as_of": ... | benzyl-chloride | 5 | 1 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Benzyl chloride | 100-44-7 | 1 | 5 | - | | Benzyl chloride | https://referencesource.org/workplace-exposure-limits/benzyl-chloride/ | [
"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/npgd0054.html",
"source_quote": "NIOSH REL Ca See Appendix A",
"value": "Ca See Appendix A"
}
] | 7440417 | [] | beryllium-and-beryllium-compounds | 0.0002 | null | https://www.dir.ca.gov/title8/5155.html | 7440417 | | Beryllium, and beryllium compounds | -- | 0.0002 | 0.025mg/M3 | -- | 0.002 | Beryllium, and beryllium compounds | https://referencesource.org/workplace-exposure-limits/beryllium-and-beryllium-compounds/ | [
"cas_number",
"ceiling",
"ceiling_notation",
"pel_mgm3",
"stel_mgm3",
"substance"
] | null | null | null | a ceiling value in addition to the TWA values | 0.002 | null | 0.025mg/M3 |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0133.html",
"source_quote": "NIOSH REL Ca C 1 ppm (3.6 mg/m3) [15-minute]",
"value": "C 1"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/n... | 126-99-8 | [
{
"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": "beta-Chloroprene | 126-99-8 | 25 | 90 | X |",
"value": "25"
},
{
"as_o... | beta-chloroprene | 90 | 25 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | beta-Chloroprene | 126-99-8 | 25 | 90 | X | | beta-Chloroprene | https://referencesource.org/workplace-exposure-limits/beta-chloroprene/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 91-59-8 | [] | beta-naphthylamine | null | null | https://www.cdc.gov/niosh/npg/npgd0442.html | NIOSH REL Ca See Appendix A | beta-Naphthylamine | https://referencesource.org/workplace-exposure-limits/beta-naphthylamine/ | [
"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": "57578 | | beta-Propiolactone, see Section 5209 | 0.5 | 1.5",
"value": "0.5"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",
"source": "https://www... | 57-57-8 | [] | beta-propiolactone | null | null | https://www.cdc.gov/niosh/npg/npgd0528.html | NIOSH REL Ca See Appendix A | beta-Propiolactone | https://referencesource.org/workplace-exposure-limits/beta-propiolactone/ | [
"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/npgd0239.html",
"source_quote": "NIOSH REL TWA 1 mg/m3 (0.2 ppm)",
"value": "0.2"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd... | 92524 | [
{
"field": "pel_mgm3",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "92524 | | Biphenyl; diphenyl; phenylbenzene | 0.2 | 1.5",
"value": "1.5"
},
{
"as_of": "2026-08-05T00:00:00",... | biphenyl-diphenyl-phenylbenzene | 1.5 | 0.2 | https://www.dir.ca.gov/title8/5155.html | 92524 | | Biphenyl; diphenyl; phenylbenzene | 0.2 | 1.5 | Biphenyl; diphenyl; phenylbenzene | https://referencesource.org/workplace-exposure-limits/biphenyl-diphenyl-phenylbenzene/ | [
"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": "3033623 | S | Bis (Dimethylaminoethyl) ether (DMAEE) | 0.05 | 0.328 | | 0.15 | 0.983",
"value": "0.05"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",... | 3033-62-3 | [] | bis-2-dimethylamino-ethyl-ether | null | null | https://www.cdc.gov/niosh/npg/npgd0221.html | NIOSH REL See Appendix C (NIAX® Catalyst ESN) | bis(2-(Dimethylamino)ethyl)ether | https://referencesource.org/workplace-exposure-limits/bis-2-dimethylamino-ethyl-ether/ | [
"cas_number",
"rel_statement",
"substance"
] | See Appendix C (NIAX® Catalyst ESN) | 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": "542881 | | bis-Chloromethyl ether, see also Section 5209 | 0.001 | 0.005",
"value": "0.001"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",
"sourc... | 542-88-1 | [] | bis-chloromethyl-ether | null | null | https://www.cdc.gov/niosh/npg/npgd0128.html | NIOSH REL Ca See Appendix A | bis-Chloromethyl ether | https://referencesource.org/workplace-exposure-limits/bis-chloromethyl-ether/ | [
"cas_number",
"rel_statement",
"substance"
] | Ca See Appendix A | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_statement",
"source": "https://www.cdc.gov/niosh/npg/npgd0056.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)"
}
] | 1304821 | [] | bismuth-telluride | null | null | https://www.dir.ca.gov/title8/5155.html | 1304821 | | Bismuth telluride | Bismuth telluride | https://referencesource.org/workplace-exposure-limits/bismuth-telluride/ | [
"cas_number",
"substance"
] | null | null | null | null | null | null | null |
null | null | null | bismuth-telluride-selenium-doped | 5 | null | https://www.dir.ca.gov/title8/5155.html | Bismuth telluride (selenium-doped) | -- | 5 | Bismuth telluride (selenium-doped) | https://referencesource.org/workplace-exposure-limits/bismuth-telluride-selenium-doped/ | [
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 1330-43-4 | null | borates-tetra-sodium-salts-anhydrous | null | null | https://www.cdc.gov/niosh/npg/npgd0057.html | NIOSH REL TWA 1 mg/m3 | Borates, tetra, sodium salts (Anhydrous) | https://referencesource.org/workplace-exposure-limits/borates-tetra-sodium-salts-anhydrous/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 1 | null | null | null | null | null |
null | 1303-96-4 | null | borates-tetra-sodium-salts-decahydrate | null | null | https://www.cdc.gov/niosh/npg/npgd0058.html | NIOSH REL TWA 5 mg/m3 | Borates, tetra, sodium salts (Decahydrate) | https://referencesource.org/workplace-exposure-limits/borates-tetra-sodium-salts-decahydrate/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 5 | null | null | null | null | null |
null | 12179-04-3 | null | borates-tetra-sodium-salts-pentahydrate | null | null | https://www.cdc.gov/niosh/npg/npgd0059.html | NIOSH REL TWA 1 mg/m3 | Borates, tetra, sodium salts (Pentahydrate) | https://referencesource.org/workplace-exposure-limits/borates-tetra-sodium-salts-pentahydrate/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 1 | 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": "1303862 | | Boron oxide | -- | 10",
"value": "10"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd00... | 1303-86-2 | [] | boron-oxide | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Boron oxide | 1303-86-2 | - | - | - | | Boron oxide | https://referencesource.org/workplace-exposure-limits/boron-oxide/ | [
"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/npgd0061.html",
"source_quote": "NIOSH REL C 1 ppm (10 mg/m3)",
"value": "C 1"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd006... | 10294334 | [] | boron-tribromide | 10 | 1 | https://www.dir.ca.gov/title8/5155.html | 10294334 | | Boron tribromide | 1 | 10 | C | Boron tribromide | https://referencesource.org/workplace-exposure-limits/boron-tribromide/ | [
"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": "2026-09-28T00:00:00",
"field": "ceiling_notation",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "7637072 | | Boron trifluoride | 1 | 3 | C",
"value": "the values given in the PEL columns are ceiling values"
},
{
"as_of": "2026-09-08T00:00:00",
"fie... | 7637-07-2 | [
{
"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": "Boron trifluoride | 7637-07-2 | (C)1 | (C)3 | - |",
"value": "(C)1"
},
{
... | boron-trifluoride | (C)3 | (C)1 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Boron trifluoride | 7637-07-2 | (C)1 | (C)3 | - | | Boron trifluoride | https://referencesource.org/workplace-exposure-limits/boron-trifluoride/ | [
"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/npgd0063.html",
"source_quote": "NIOSH REL TWA 1 ppm (10 mg/m3)",
"value": "TWA 1"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npg... | 314409 | [] | bromacil | 10 | 1 | https://www.dir.ca.gov/title8/5155.html | 314409 | | Bromacil | 1 | 10 | Bromacil | https://referencesource.org/workplace-exposure-limits/bromacil/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-28T00:00:00",
"field": "ceiling_notation",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "7726956 | | Bromine | 0.1 | 0.7 | C",
"value": "the values given in the PEL columns are ceiling values"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "... | 7726-95-6 | [] | bromine | 0.7 | 0.1 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Bromine | 7726-95-6 | 0.1 | 0.7 | - | | Bromine | https://referencesource.org/workplace-exposure-limits/bromine/ | [
"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/npgd0065.html",
"source_quote": "NIOSH REL TWA 0.1 ppm (0.7 mg/m³)",
"value": "TWA 0.1"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/np... | 7789302 | [] | bromine-pentafluoride | 0.7 | 0.1 | https://www.dir.ca.gov/title8/5155.html | 7789302 | | Bromine pentafluoride | 0.1 | 0.7 | Bromine pentafluoride | https://referencesource.org/workplace-exposure-limits/bromine-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/npgd0066.html",
"source_quote": "NIOSH REL TWA 0.5 ppm (5 mg/m3) [skin]",
"value": "TWA 0.5"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/nio... | 75-25-2 | [] | bromoform | 5 | 0.5 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Bromoform | 75-25-2 | 0.5 | 5 | X | | Bromoform | https://referencesource.org/workplace-exposure-limits/bromoform/ | [
"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/npgd0068.html",
"source_quote": "NIOSH REL TWA 800 ppm (1900 mg/m³)",
"value": "TWA 800"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/n... | 106978 | [] | butane | 1,900 | 800 | https://www.dir.ca.gov/title8/5155.html | 106978 | | Butane | 800 | 1,900 | Butane | https://referencesource.org/workplace-exposure-limits/butane/ | [
"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/npgd0075.html",
"source_quote": "NIOSH REL TWA 10 ppm (55 mg/m³)",
"value": "TWA 10"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/n... | 141322 | [] | butyl-acrylate | 11 | 2 | https://www.dir.ca.gov/title8/5155.html | 141322 | | Butyl acrylate | 2 | 11 | Butyl acrylate | https://referencesource.org/workplace-exposure-limits/butyl-acrylate/ | [
"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/npgd0083.html",
"source_quote": "NIOSH REL C 0.5 ppm (1.8 mg/m3) [15-minute]",
"value": "C 0.5"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/... | 109-79-5 | [
{
"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": "Butyl mercaptan | 109-79-5 | 10 | 35 | - |",
"value": "10"
},
{
"as_of... | butyl-mercaptan | 35 | 10 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Butyl mercaptan | 109-79-5 | 10 | 35 | - | | Butyl mercaptan | https://referencesource.org/workplace-exposure-limits/butyl-mercaptan/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-28T00:00:00",
"field": "ceiling_notation",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "109739 | S | Butylamine | 5 | 15 | C",
"value": "the values given in the PEL columns are ceiling values"
},
{
"as_of": "2026-09-08T00:00:00",
"field": ... | 109-73-9 | [
{
"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": "Butylamine | 109-73-9 | (C)5 | (C)15 | X |",
"value": "(C)5"
},
{
"as_... | butylamine | (C)15 | (C)5 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Butylamine | 109-73-9 | (C)5 | (C)15 | X | | Butylamine | https://referencesource.org/workplace-exposure-limits/butylamine/ | [
"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/npgd0087.html",
"source_quote": "NIOSH REL Ca See Appendix A",
"value": "Ca See Appendix A"
}
] | 7440-43-9 | [] | cadmium-as-cd-see-1910-1027 | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Cadmium (as Cd); see 1910.1027 | 7440-43-9 | - | - | - | | Cadmium (as Cd); see 1910.1027 | https://referencesource.org/workplace-exposure-limits/cadmium-as-cd-see-1910-1027/ | [
"cas_number",
"substance"
] | null | null | null | null | null | null | null |
null | 1306-19-0 (CdO) | [] | cadmium-fume-as-cd | null | null | https://www.cdc.gov/niosh/npg/npgd0088.html | NIOSH REL Ca See Appendix A | Cadmium fume (as Cd) | https://referencesource.org/workplace-exposure-limits/cadmium-fume-as-cd/ | [
"cas_number",
"rel_statement",
"substance"
] | Ca See Appendix A | null | null | null | null | null | null |
null | 7778-44-1 | [] | calcium-arsenate-as-as | null | null | https://www.cdc.gov/niosh/npg/npgd0089.html | NIOSH REL Ca C 0.002 mg/m3 [15-minute] | Calcium arsenate (as As) | https://referencesource.org/workplace-exposure-limits/calcium-arsenate-as-as/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | C 0.002 | null | null | null | null | null |
null | 1317-65-3 | null | calcium-carbonate | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Calcium carbonate | 1317-65-3 | - | - | - | | Calcium carbonate | https://referencesource.org/workplace-exposure-limits/calcium-carbonate/ | [
"cas_number",
"substance"
] | null | null | null | null | null | null | null |
null | 471-34-1 (synthetic) 1317-65-3 (natural) | null | calcium-carbonate-2 | null | null | https://www.cdc.gov/niosh/npg/npgd0090.html | NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp) | Calcium carbonate | https://referencesource.org/workplace-exposure-limits/calcium-carbonate-2/ | [
"cas_number",
"rel_statement",
"substance"
] | TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp) | null | null | null | null | null | null |
null | 471341 | null | calcium-carbonate-see-particulates-not-otherwise-regulated | null | null | https://www.dir.ca.gov/title8/5155.html | 471341 | | Calcium carbonate; see Particulates not otherwise regulated | -- | Calcium carbonate; see Particulates not otherwise regulated | https://referencesource.org/workplace-exposure-limits/calcium-carbonate-see-particulates-not-otherwise-regulated/ | [
"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/npgd0091.html",
"source_quote": "NIOSH REL TWA 0.5 mg/m3",
"value": "TWA 0.5"
}
] | 156627 | [] | calcium-cyanamide | 0.5 | null | https://www.dir.ca.gov/title8/5155.html | 156627 | | Calcium cyanamide | -- | 0.5 | Calcium cyanamide | https://referencesource.org/workplace-exposure-limits/calcium-cyanamide/ | [
"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": "1305620 | | Calcium hydroxide | -- | 5",
"value": "5"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/np... | 1305-62-0 | [] | calcium-hydroxide | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Calcium hydroxide | 1305-62-0 | - | - | - | | Calcium hydroxide | https://referencesource.org/workplace-exposure-limits/calcium-hydroxide/ | [
"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/npgd0093.html",
"source_quote": "NIOSH REL TWA 2 mg/m3",
"value": "TWA 2"
}
] | 1305-78-8 | [
{
"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": "Calcium oxide | 1305-78-8 | - | 5 | - |",
"value": "5"
},
{
"as_of": ... | calcium-oxide | 5 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Calcium oxide | 1305-78-8 | - | 5 | - | | Calcium oxide | https://referencesource.org/workplace-exposure-limits/calcium-oxide/ | [
"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/npgd0094.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)"
}
] | 1344-95-2 | [] | calcium-silicate | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Calcium silicate | 1344-95-2 | - | - | - | | Calcium silicate | https://referencesource.org/workplace-exposure-limits/calcium-silicate/ | [
"cas_number",
"substance"
] | null | null | null | null | null | null | null |
null | 1592230 | null | calcium-stearate | 10 | null | https://www.dir.ca.gov/title8/5155.html | 1592230 | | Calcium stearate | -- | 10 | Calcium stearate | https://referencesource.org/workplace-exposure-limits/calcium-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/npgd0095.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)"
}
] | 7778-18-9 | [] | calcium-sulfate | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Calcium sulfate | 7778-18-9 | - | - | - | | Calcium sulfate | https://referencesource.org/workplace-exposure-limits/calcium-sulfate/ | [
"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/npgd0096.html",
"source_quote": "NIOSH REL TWA 2 mg/m3",
"value": "TWA 2"
}
] | 76-22-2 | [] | camphor-synthetic | 2 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Camphor, synthetic | 76-22-2 | - | 2 | - | | Camphor, synthetic | https://referencesource.org/workplace-exposure-limits/camphor-synthetic/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 105-60-2 | null | caprolactam | null | null | https://www.cdc.gov/niosh/npg/npgd0097.html | NIOSH REL Dust: TWA 1 mg/m3 ST 3 mg/m3 Vapor: TWA 0.22 ppm (1 mg/m3) ST 0.66 ppm (3 mg/m3) | Caprolactam | https://referencesource.org/workplace-exposure-limits/caprolactam/ | [
"cas_number",
"rel_statement",
"substance"
] | Dust: TWA 1 mg/m3 ST 3 mg/m3 Vapor: TWA 0.22 ppm (1 mg/m3) ST 0.66 ppm (3 mg/m3) | null | null | null | null | null | null |
null | 105602 | null | caprolactam-dust | 1 | null | https://www.dir.ca.gov/title8/5155.html | 105602 | | Caprolactam dust | -- | 1 | | -- | 3 | Caprolactam dust | https://referencesource.org/workplace-exposure-limits/caprolactam-dust/ | [
"cas_number",
"pel_mgm3",
"stel_mgm3",
"substance"
] | null | null | null | null | 3 | null | null |
null | 105602 | null | caprolactam-vapor | 20 | 5 | https://www.dir.ca.gov/title8/5155.html | 105602 | | Caprolactam vapor | 5 | 20 | | 10 | 40 | Caprolactam vapor | https://referencesource.org/workplace-exposure-limits/caprolactam-vapor/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"stel_mgm3",
"stel_ppm",
"substance"
] | null | null | null | null | 40 | 10 | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0098.html",
"source_quote": "NIOSH REL Ca TWA 0.1 mg/m3 [skin]",
"value": "TWA 0.1"
}
] | 2425061 | [] | captafol | 0.1 | null | https://www.dir.ca.gov/title8/5155.html | 2425061 | S | Captafol | -- | 0.1 | Captafol | https://referencesource.org/workplace-exposure-limits/captafol/ | [
"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/npgd0099.html",
"source_quote": "NIOSH REL Ca TWA 5 mg/m3",
"value": "TWA 5"
}
] | 133062 | [] | captan | 5 | null | https://www.dir.ca.gov/title8/5155.html | 133062 | | Captan | -- | 5 | Captan | https://referencesource.org/workplace-exposure-limits/captan/ | [
"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": "63252 | | Carbaryl; 1-naphthyl N-methylcarbamate | -- | 5",
"value": "5"
}
] | 63-25-2 | [] | carbaryl | null | null | https://www.cdc.gov/niosh/npg/npgd0100.html | NIOSH REL TWA 5 mg/m3 | Carbaryl | https://referencesource.org/workplace-exposure-limits/carbaryl/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 5 | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0101.html",
"source_quote": "NIOSH REL TWA 0.1 mg/m3",
"value": "TWA 0.1"
}
] | 1563662 | [] | carbofuran | 0.1 | null | https://www.dir.ca.gov/title8/5155.html | 1563662 | | Carbofuran | -- | 0.1 | Carbofuran | https://referencesource.org/workplace-exposure-limits/carbofuran/ | [
"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/npgd0102.html",
"source_quote": "NIOSH REL TWA 3.5 mg/m3 Ca TWA 0.1 mg PAHs/m3 [Carbon black in presence of polycyclic aromatic hydrocarbons (PAHs)]",
"value": "TWA 3.5"
}
] | 1333-86-4 | [] | carbon-black | 3.5 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Carbon black | 1333-86-4 | - | 3.5 | - | | Carbon black | https://referencesource.org/workplace-exposure-limits/carbon-black/ | [
"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": "124389 | | Carbon dioxide | 5,000 | 9,000 | | 30,000 | 54,000",
"value": "30,000"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "htt... | 124-38-9 | [] | carbon-dioxide | 9000 | 5000 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Carbon dioxide | 124-38-9 | 5000 | 9000 | - | | Carbon dioxide | https://referencesource.org/workplace-exposure-limits/carbon-dioxide/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-28T00:00:00",
"field": "pel_ppm",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "75150 | S | Carbon disulfide | 1 | 3 | 30 ppm | 12 | 36",
"value": "1"
},
{
"as_of": "2026-09-28T00:00:00",
"field": "pel_mgm3",
"source": "https://www.dir.... | 75-15-0 | [] | carbon-disulfide | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Carbon disulfide | 75-15-0 | - | (2) | - | | Carbon disulfide | https://referencesource.org/workplace-exposure-limits/carbon-disulfide/ | [
"cas_number",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-28T00:00:00",
"field": "ceiling",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "630080 | | Carbon monoxide | 25 | 29 | 200 ppm",
"value": "200 ppm"
},
{
"as_of": "2026-09-28T00:00:00",
"field": "ceiling_notation",
"source": "https://www... | 630-08-0 | [
{
"field": "pel_ppm",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Carbon monoxide | 630-08-0 | 50 | 55 | - |",
"value": "50"
},
{
"as_of... | carbon-monoxide | 55 | 50 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Carbon monoxide | 630-08-0 | 50 | 55 | - | | Carbon monoxide | https://referencesource.org/workplace-exposure-limits/carbon-monoxide/ | [
"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/npgd0106.html",
"source_quote": "NIOSH REL TWA 0.1 ppm (1.4 mg/m3) ST 0.3 ppm (4 mg/m3)",
"value": "TWA 0.1"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https:/... | 558134 | [] | carbon-tetrabromide | 1.4 | 0.1 | https://www.dir.ca.gov/title8/5155.html | 558134 | | Carbon tetrabromide | 0.1 | 1.4 | | 0.3 | 4 | Carbon tetrabromide | https://referencesource.org/workplace-exposure-limits/carbon-tetrabromide/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"stel_mgm3",
"stel_ppm",
"substance"
] | null | null | null | null | 4 | 0.3 | null |
[
{
"as_of": "2026-09-28T00:00:00",
"field": "pel_ppm",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "56235 | S | Carbon tetrachloride | 2 | 12.6 | 200 ppm | 10 | 63",
"value": "2"
},
{
"as_of": "2026-09-28T00:00:00",
"field": "pel_mgm3",
"source": "https://... | 56-23-5 | [] | carbon-tetrachloride | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Carbon tetrachloride | 56-23-5 | - | (2) | - | | Carbon tetrachloride | https://referencesource.org/workplace-exposure-limits/carbon-tetrachloride/ | [
"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/npgd0108.html",
"source_quote": "NIOSH REL TWA 2 ppm (5 mg/m3) ST 5 ppm (15 mg/m3)",
"value": "TWA 2"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cd... | 353504 | [] | carbonyl-fluoride | 5 | 2 | https://www.dir.ca.gov/title8/5155.html | 353504 | | Carbonyl fluoride | 2 | 5 | | 5 | 15 | Carbonyl fluoride | https://referencesource.org/workplace-exposure-limits/carbonyl-fluoride/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"stel_mgm3",
"stel_ppm",
"substance"
] | null | null | null | null | 15 | 5 | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_ppm",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "120809 | S | Catechol; pyrocatechol | 5 | 20",
"value": "5"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",
"source": "https://www.dir.ca.gov/titl... | 120-80-9 | [] | catechol | null | null | https://www.cdc.gov/niosh/npg/npgd0109.html | NIOSH REL TWA 5 ppm (20 mg/m3) [skin] | Catechol | https://referencesource.org/workplace-exposure-limits/catechol/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 20 | TWA 5 | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_statement",
"source": "https://www.cdc.gov/niosh/npg/npgd0110.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)"
}
] | 9004-34-6 | [] | cellulose | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Cellulose | 9004-34-6 | - | - | - | | Cellulose | https://referencesource.org/workplace-exposure-limits/cellulose/ | [
"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/npgd0111.html",
"source_quote": "NIOSH REL TWA 2 mg/m3",
"value": "TWA 2"
}
] | 21351791 | [] | cesium-hydroxide | null | 2 | https://www.dir.ca.gov/title8/5155.html | 21351791 | | Cesium hydroxide | 2 | Cesium hydroxide | https://referencesource.org/workplace-exposure-limits/cesium-hydroxide/ | [
"cas_number",
"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/npgd0112.html",
"source_quote": "NIOSH REL Ca TWA 0.5 mg/m3 [skin]",
"value": "TWA 0.5"
}
] | 57-74-9 | [] | chlordane | 0.5 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Chlordane | 57-74-9 | - | 0.5 | X | | Chlordane | https://referencesource.org/workplace-exposure-limits/chlordane/ | [
"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/npgd0113.html",
"source_quote": "NIOSH REL Ca [skin] See Appendix A",
"value": "Ca [skin] See Appendix A"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "htt... | 8001-35-2 | [] | chlorinated-camphene | 0.5 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Chlorinated camphene | 8001-35-2 | - | 0.5 | X | | Chlorinated camphene | https://referencesource.org/workplace-exposure-limits/chlorinated-camphene/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 55720-99-5 | [] | chlorinated-diphenyl-oxide | 0.5 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Chlorinated diphenyl oxide | 55720-99-5 | - | 0.5 | - | | Chlorinated diphenyl oxide | https://referencesource.org/workplace-exposure-limits/chlorinated-diphenyl-oxide/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
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