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Oregon OSHA Protection from Wildfire Smoke (OAR 437-002-1081) — Wildfire Smoke Exposure Thresholds (PM2.5 / AQI)

Oregon wildfire smoke protection rule (OAR 437-002-1081 / 437-004-9791). PM2.5 concentration is canonical; AQI equivalents shift with EPA breakpoints.

Open Oregon OSHA Protection from Wildfire Smoke (OAR 437-002-1081) in the interactive Guidance Wiki →

Authority
Oregon Occupational Safety and Health Division (Oregon OSHA)
Jurisdiction
Oregon State Us
Legal status
Regulation
Rule type
Smoke Overlay
Standard ID
HGC-075

Governing formula

No standalone formula is published for this standard; see programmable logic and parameters below.

Wildfire smoke thresholds

PM2.5Respirator requirement
34.5 µg/m³PM2.5 below Oregon OSHA wildfire smoke training trigger (35.5 µg/m³).
35.6 µg/m³Voluntary — PM2.5 ≥35.5 µg/m³ (training + voluntary respirator)
201 µg/m³Mandatory FFR — PM2.5 ≥200.9 µg/m³ (mandatory filtering facepiece use)
500.5 µg/m³Full RPP — PM2.5 ≥500.4 µg/m³ (full respiratory protection program)

Wildfire smoke overlays are excluded from the work/rest composite and are never averaged with WBGT-based standards.

Inputs

Required inputs: none

Optional inputs: pm25ugm3, aqiPm25, usStateCode, wildfireSmoke, outdoor

Sources

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