OAR 437-002-1055: Permissible Exposure Limit (PEL)

Edition: Current OARD snapshotEffective: 2018-07-01Last verified: 2026-09-07

Ensure that no employee is exposed to an airborne concentration of respirable crystalline silica in excess of 50 μg/m3, calculated as an 8-hour time-weighted average (TWA).

Official history and status

Statutory/Other Authority: ORS 654.025(2) & 656.726(4).

Statutes/Other Implemented: ORS 654.001- 654.295

History: OSHA 5-2016, f. 9-23-16, cert. ef. 7-1-18

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Official source: https://secure.sos.state.or.us/oard/