Identify harmful exposure to airborne particulate matter from wildfire smoke before each shift and periodically thereafter checking the AQI
for PM2.5 in regions where workers are located.
Reduce harmful exposure to wildfire smoke if feasible, for example, by relocating work to an enclosed building with filtered air or to an
outdoor location where AQI for PM2.5 is 150 or lower.
If employers cannot reduce workers' harmful exposure to wildfire smoke so that the AQI for PM2.5 is 150 or lower, the must provide: a)
Respirators such as N95 masks
for all employees for voluntary use, b) training on the new regulation, the health effects of wildfire smoke,
and the safe use and maintenance of respirators.
Employers should be aware that an AQI (as found on airnow.gov etc.) that represents a broad area or county may not represent actual workplace AQI. Site workplace
monitors (such as PurpleAir etc.) might provide better local information but could also be problematic given their data unreliability and that they are not regulatory monitors.