Occupational Exposure Limits Crosswalk 2026 — OSHA PEL / NIOSH REL / ACGIH TLV / UK WEL / EU IOELV

This dataset provides a side-by-side comparison of Occupational Exposure Limits (OELs) for 28 well-documented industrial substances across five major regulatory and advisory frameworks: US OSHA Permissible Exposure Limits (PELs) from 29 CFR 1910.1000 Table Z-1/Z-2/Z-3, US NIOSH Recommended Exposure Limits (RELs), ACGIH Threshold Limit Values (TLV-TWA, 2024 edition), UK Workplace Exposure Limits from EH40/2005 (4th edition, 2020), and EU Indicative Occupational Exposure Limit Values from Directive 2017/164/EU and subsequent amendments. Substances were selected on the basis that all or most limit values are traceable to primary published sources and are widely cited in occupational hygiene practice. Where a value was uncertain, differed materially across secondary references, or could not be verified against the primary source, the cell has been left blank. A blank cell does not mean no limit exists — it means the compilers could not confirm the value with sufficient confidence for a permanent public record. Units are stated per row (ppm or mg/m³). Where a substance is typically expressed in mg/m³ only (e.g. respirable dusts, mists), ppm columns are left blank. All TWA limits refer to an 8-hour time-weighted average over a nominal 40-hour working week unless the notes column states otherwise. Short-term exposure limits (STELs) and ceiling values are noted where especially prominent but are not the primary comparison metric of this dataset. Accuracy notice: OELs change as new toxicological evidence emerges. Users must verify all values against the current version of the authoritative source before applying them in risk assessments, compliance decisions, or engineering controls. This dataset reflects information available to the compilers as of early 2026 and carries no warranty of current accuracy. Regulatory limits (OSHA PEL, UK WEL, EU IOELV) are legal minima in their respective jurisdictions; advisory values (NIOSH REL, ACGIH TLV) may be more protective.