substance stringlengths 4 38 | cas_number stringlengths 7 10 ⌀ | osha_pel_twa float64 0.05 5k ⌀ | niosh_rel float64 0.01 5k ⌀ | acgih_tlv_twa float64 0.01 5k ⌀ | uk_wel_twa_eh40 float64 0.02 5k ⌀ | eu_ioelv float64 0.1 5k ⌀ | units stringclasses 2
values | notes stringlengths 81 392 |
|---|---|---|---|---|---|---|---|---|
Acetone | 67-64-1 | 1,000 | 250 | 250 | 500 | 500 | ppm | OSHA PEL from 29 CFR 1910.1000 Table Z-1. ACGIH TLV 2024. UK WEL EH40. EU IOELV 2017/164/EU Annex I. |
Ammonia | 7664-41-7 | 50 | 25 | 25 | 25 | 20 | ppm | OSHA PEL Table Z-1. NIOSH REL 10-h TWA. ACGIH TLV 2024. UK WEL EH40 4th ed. EU IOELV 2017/164/EU. |
Benzene | 71-43-2 | 1 | 0.1 | 0.5 | 1 | 0.5 | ppm | OSHA PEL 29 CFR 1910.1028 (substance-specific standard). NIOSH REL = lowest feasible; 0.1 ppm used here. ACGIH TLV-TWA 2024 (A1 carcinogen). UK WEL EH40 with notation 'Sk'. EU IOELV 2017/164/EU 0.5 ppm. All values approximate — verify against current source before use. |
Carbon dioxide | 124-38-9 | 5,000 | 5,000 | 5,000 | 5,000 | 5,000 | ppm | OSHA PEL Table Z-1. NIOSH REL. ACGIH TLV 2024. UK WEL EH40. EU IOELV 2017/164/EU. |
Carbon monoxide | 630-08-0 | 50 | 35 | 25 | 20 | 20 | ppm | OSHA PEL Table Z-1 50 ppm. NIOSH REL 35 ppm (10-h TWA) with ceiling 200 ppm. ACGIH TLV-TWA 2024 25 ppm. UK WEL EH40 20 ppm. EU IOELV 2019/1831/EU 20 ppm. |
Chlorine | 7782-50-5 | 1 | null | 0.5 | 0.5 | 0.5 | ppm | OSHA PEL Table Z-1 1 ppm ceiling. NIOSH REL is a ceiling of 0.5 ppm — not directly comparable as a TWA; left blank. ACGIH TLV-C 0.5 ppm (ceiling, not TWA). UK WEL EH40 0.5 ppm. EU IOELV 2017/164/EU. |
Formaldehyde | 50-00-0 | 0.75 | 0.016 | 0.1 | 2 | 0.3 | ppm | OSHA PEL 29 CFR 1910.1048 action level 0.5 ppm / PEL 0.75 ppm TWA. NIOSH REL = ceiling 0.016 ppm (15-min). ACGIH TLV-C 0.1 ppm (ceiling). UK WEL EH40 2 ppm (8-h) — verify against current EH40. EU IOELV 2019/130/EU 0.3 ppm. Values differ substantially across frameworks; verify before use. |
Hexane (n-hexane) | 110-54-3 | 500 | 50 | 50 | 20 | null | ppm | OSHA PEL Table Z-1 500 ppm (all hexane isomers). NIOSH REL and ACGIH TLV-TWA 2024 are 50 ppm for n-hexane specifically (neurotoxin). UK WEL EH40 20 ppm for n-hexane. EU IOELV not established for n-hexane as of 2024 — verify current status. |
Hydrogen cyanide | 74-90-8 | 10 | null | 4.7 | 0.9 | null | ppm | OSHA PEL Table Z-2 10 ppm ceiling. NIOSH: no TWA REL — ceiling 4.7 ppm (10-min). ACGIH TLV-C 4.7 ppm ceiling; not directly a TWA. UK WEL EH40 0.9 ppm (8-h TWA) with Sk notation. EU IOELV not confirmed — left blank. |
Hydrogen sulfide | 7783-06-4 | 20 | null | 1 | 1 | 5 | ppm | OSHA PEL Table Z-2 ceiling 20 ppm / peak 50 ppm. NIOSH REL 10-h TWA 1 ppm. ACGIH TLV-TWA 2024 1 ppm. UK WEL EH40 1 ppm. EU IOELV Directive 2017/164/EU 5 ppm — verify amendment status. |
Isocyanates (MDI) | 101-68-8 | null | 0.005 | 0.005 | 0.02 | null | mg/m3 | MDI = methylene diphenyl diisocyanate. OSHA PEL not established as substance-specific TWA for MDI — verify 29 CFR 1910.1000 Table Z. NIOSH REL 0.005 mg/m3 (10-h TWA). ACGIH TLV-TWA 2024 0.005 mg/m3. UK WEL EH40 0.02 mg/m3 (as NCO) — verify current EH40. EU IOELV not confirmed — left blank. |
Lead | 7439-92-1 | 0.05 | null | 0.05 | 0.15 | null | mg/m3 | OSHA PEL 29 CFR 1910.1025 (lead standard) 0.05 mg/m3 TWA. ACGIH TLV-TWA 2024 0.05 mg/m3. UK WEL EH40 0.15 mg/m3. EU IOELV not yet in force for general industry as at 2024 — verify Council Directive 98/24/EC status. All as inorganic lead dust/fume. |
Mercury (vapour) | 7439-97-6 | null | 0.05 | 0.025 | 0.02 | null | mg/m3 | OSHA PEL for mercury vapour from Table Z-2 (0.1 mg/m3 ceiling) — TWA PEL uncertain; left blank. NIOSH REL 0.05 mg/m3 (10-h TWA). ACGIH TLV-TWA 2024 0.025 mg/m3. UK WEL EH40 0.02 mg/m3. EU IOELV not confirmed — left blank. |
Methanol | 67-56-1 | 200 | 200 | 200 | 200 | 260 | ppm | OSHA PEL Table Z-1 200 ppm. NIOSH REL 200 ppm with Sk. ACGIH TLV-TWA 2024 200 ppm Sk. UK WEL EH40 200 ppm. EU IOELV 2017/164/EU 260 ppm — verify current directive. |
Nitric acid | 7697-37-2 | 2 | 2 | 2 | 1 | null | ppm | OSHA PEL Table Z-1 2 ppm. NIOSH REL 2 ppm (1-h ceiling). ACGIH TLV-TWA 2024 2 ppm. UK WEL EH40 1 ppm — verify. EU IOELV not confirmed — left blank. |
Nitrogen dioxide | 10102-44-0 | 5 | 1 | 0.2 | 0.5 | 0.5 | ppm | OSHA PEL Table Z-1 5 ppm ceiling. NIOSH REL 1 ppm (15-min ceiling). ACGIH TLV-TWA 2024 0.2 ppm. UK WEL EH40 0.5 ppm. EU IOELV 2017/164/EU 0.5 ppm. |
Ozone | 10028-15-6 | 0.1 | 0.1 | 0.05 | 0.2 | 0.2 | ppm | OSHA PEL Table Z-1 0.1 ppm. NIOSH REL 0.1 ppm (2-h TWA for heavy work). ACGIH TLV-TWA 2024 0.05 ppm (light work, 8-h). UK WEL EH40 0.2 ppm. EU IOELV 2017/164/EU 0.2 ppm. Note: ACGIH value depends on work intensity. |
Respirable crystalline silica (quartz) | 14808-60-7 | 0.05 | null | 0.025 | 0.1 | 0.1 | mg/m3 | OSHA PEL 0.05 mg/m3 (29 CFR 1910.1053 silica standard, 2016). NIOSH REL 0.05 mg/m3 recommended; NIOSH considers any exposure a risk — 0.025 mg/m3 action level used by some. ACGIH TLV-TWA 2024 0.025 mg/m3 (respirable fraction). UK WEL EH40 0.1 mg/m3. EU IOELV 2017/2398/EU 0.1 mg/m3 (transition periods apply). |
Styrene | 100-42-5 | 100 | 50 | 20 | 100 | 20 | ppm | OSHA PEL Table Z-2 100 ppm TWA / ceiling 200 ppm. NIOSH REL 50 ppm (10-h TWA). ACGIH TLV-TWA 2024 20 ppm (A4, possible carcinogen). UK WEL EH40 100 ppm. EU IOELV 2019/1831/EU 20 ppm. |
Sulfur dioxide | 7446-09-5 | 5 | 0.5 | 0.25 | 0.5 | 0.5 | ppm | OSHA PEL Table Z-1 5 ppm. NIOSH REL 0.5 ppm (10-h TWA). ACGIH TLV-TWA 2024 0.25 ppm. UK WEL EH40 0.5 ppm. EU IOELV 2017/164/EU 0.5 ppm. |
Sulfuric acid mist | 7664-93-9 | 1 | null | 0.2 | 0.1 | null | mg/m3 | OSHA PEL Table Z-1 1 mg/m3. ACGIH TLV-TWA 2024 0.2 mg/m3 (thoracic fraction; A2 suspected human carcinogen). UK WEL EH40 0.1 mg/m3 (inhalable). EU IOELV not confirmed — left blank. NIOSH REL not confirmed as a TWA — left blank. |
Toluene | 108-88-3 | 200 | 100 | 20 | 50 | 50 | ppm | OSHA PEL Table Z-2 200 ppm (300 ppm ceiling / 500 ppm peak). NIOSH REL 100 ppm (10-h TWA). ACGIH TLV-TWA 2024 20 ppm. UK WEL EH40 50 ppm. EU IOELV 2017/164/EU 50 ppm. |
Trichloroethylene | 79-01-6 | 100 | 1 | 10 | 10 | 10 | ppm | OSHA PEL Table Z-2 100 ppm. NIOSH: suspected occupational carcinogen — REL 1 ppm (lowest feasible). ACGIH TLV-TWA 2024 10 ppm (A2). UK WEL EH40 10 ppm. EU IOELV Directive 2017/164/EU 10 ppm. Regulatory status evolving — verify current limits. |
Welding fume (total inhalable) | null | null | 0.1 | 1 | 1 | null | mg/m3 | No single CAS number; values for generic welding fume. OSHA PEL for fume components varies; no single Table Z total fume PEL — left blank. NIOSH REL 0.1 mg/m3 as recommended limit. ACGIH TLV-TWA 2024 1 mg/m3 (total inhalable fume). UK WEL EH40 1 mg/m3 (total inhalable). EU IOELV not established for generic welding fume... |
Wood dust (hard/oak/beech) | null | null | 1 | 1 | 3 | null | mg/m3 | No single CAS. OSHA PEL varies by wood type — no OSHA PEL specifically for hardwood dust as a category in Table Z — left blank. NIOSH REL 1 mg/m3 (hardwood). ACGIH TLV-TWA 2024 1 mg/m3 (inhalable; A1 carcinogen for hardwood). UK WEL EH40 3 mg/m3 (hardwood; note reduction under review — verify current EH40). EU IOELV Di... |
Xylene (all isomers) | 1330-20-7 | 100 | 100 | 100 | 50 | 50 | ppm | OSHA PEL Table Z-1 100 ppm. NIOSH REL 100 ppm (10-h TWA). ACGIH TLV-TWA 2024 100 ppm. UK WEL EH40 50 ppm. EU IOELV 2017/164/EU 50 ppm. |
Acetylene | 74-86-2 | null | null | null | null | 1,000 | ppm | OSHA PEL: not listed as a toxicity limit in Table Z-1 (simple asphyxiant above flammable levels) — left blank. NIOSH REL: simple asphyxiant — no TWA — left blank. ACGIH: simple asphyxiant designation — no TLV-TWA — left blank. UK WEL: no WEL published (asphyxiant). EU IOELV 2017/164/EU 1000 ppm. Flammability limits (2.... |
Ethyl acetate | 141-78-6 | 400 | 400 | 400 | 200 | 400 | ppm | OSHA PEL Table Z-1 400 ppm. NIOSH REL 400 ppm (10-h TWA). ACGIH TLV-TWA 2024 400 ppm. UK WEL EH40 200 ppm. EU IOELV 2017/164/EU 400 ppm. |
Occupational Exposure Limits Crosswalk 2026 — OSHA PEL / NIOSH REL / ACGIH TLV / UK WEL / EU IOELV
Side-by-side OEL crosswalk for 28 priority substances across OSHA 29 CFR 1910.1000, NIOSH REL, ACGIH TLV, UK EH40 WEL, and EU IOELV (2024 directive).
Details
- Publisher: SmartQHSE Ltd (https://www.smartqhse.com)
- License: CC BY 4.0
- Format: CSV (UTF-8)
- DOI: 10.5281/zenodo.20446747
- Landing page: https://www.smartqhse.com/datasets/occupational-exposure-limits-crosswalk-2026
Citation
SmartQHSE Ltd (2026). Occupational Exposure Limits Crosswalk 2026 — OSHA PEL / NIOSH REL / ACGIH TLV / UK WEL / EU IOELV [dataset]. Zenodo. https://doi.org/10.5281/zenodo.20446747
Disclaimer
Published for reference, training, and research. Consult authoritative sources before operational or compliance decisions. SmartQHSE Ltd accepts no liability for errors or omissions.
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