Oregon OSHA heat illness prevention standard (AO 3-2022). Heat-index based five-tier work/rest schedule with mandatory shade, hydration, and acclimatization.
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This rule has no numeric trigger the calculator evaluates — it states duties and control measures rather than a threshold a reading can be checked against. Its measures are listed below.
No standalone formula is published for this standard; see programmable logic and parameters below.
Programmable logic
Triggered at heat index ≥80°F. Five tiers: <80°F none; 80–89°F baseline (60/0); 90–94°F 50/10; 95–99°F 40/20; 100–104°F 30/30; ≥105°F 20/40. Impermeable or double-layer PPE advances to the next higher tier. Paid rest breaks in shade; 1 qt/hr hydration minimum.
This standard does not take WBGT as a required input, and publishes no standalone numeric parameter table here; see the governing metric and programmable logic above, and the primary source below.
Required inputs: none
Optional inputs: heatIndexC, heatIndexF, airTempC, relativeHumidity, workload, acclimatization, ppe
This standard was added to the calculator.
Get notified when Oregon OSHA Heat Illness Prevention Standard (AO 3-2022) changes — threshold changes, scope and legal-status changes, additions and removals. Changes that permit more heat exposure than before are labelled as such.
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If a threshold, trigger, exemption, date or duty here disagrees with the governing text, tell us and point at the section. The form arrives with this standard already named, and a correction is checked against the same primary document it was encoded from.