Washington permanent wildfire smoke rule (chapter WAC 296-820, effective 2024; supersedes emergency WAC 296-62-085). PM2.5 concentration is canonical and unchanged after the EPA 2024 AQI breakpoint revision.
Browse all standards → · Evaluate every standard at once in the calculator →
The drag-to-check calculator needs JavaScript. Every value it can show is a row of the table below, which is computed by the same engine.
No standalone formula is published for this standard; see programmable logic and parameters below.
| PM2.5 | Respirator requirement |
|---|---|
| 19.5 µg/m³ | PM2.5 below Washington wildfire smoke training trigger (20.5 µg/m³). |
| 20.6 µg/m³ | Voluntary — PM2.5 ≥20.5 µg/m³ (training/notification + voluntary respirator) |
| 35.6 µg/m³ | Voluntary — PM2.5 ≥35.5 µg/m³ (mandatory exposure controls + voluntary N95) |
| 500.5 µg/m³ | Full RPP — PM2.5 ≥500.4 µg/m³ (mandatory full respiratory protection program) |
| 555.1 µg/m³ | Full RPP — PM2.5 ≥555.0 µg/m³ (mandatory respirator, APF ≥ 25) |
Wildfire smoke overlays are excluded from the work/rest composite and are never averaged with WBGT-based standards.
Required inputs: none
Optional inputs: pm25ugm3, aqiPm25, usStateCode, wildfireSmoke, outdoor
This standard’s output changed in the reference scenarios, in a form that does not reduce to permitted work minutes (for example a screening limit, risk level, or respirator tier).
This standard was added to the calculator.
Get notified when Washington L&I / DOSH Wildfire Smoke Rule (WAC 296-820) changes — threshold changes, scope and legal-status changes, additions and removals. Changes that permit more heat exposure than before are labelled as such.
Paste this address into any feed reader:
https://heatrules.com/standards/washington_lni_wildfire_smoke/feed.xml
Open the feed · All update feeds · No account or email address is needed; the site keeps no subscriber list.
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.