The California Occupational Safety and Health Standards Board has adopted an emergency regulation designed to protect workers from hazards associated with wildfire smoke.

The regulation is expected to go into effect in early August and be effective for one year. It applies to workplaces where the current Air Quality Index for airborne particulate matter is 151 or greater, and where employers should reasonably anticipate that employees could be exposed to wildfire smoke.

Under the new regulation, employers must take the following steps to protect workers who may be exposed to wildfire smoke:

• Identify harmful exposure to airborne particulate matter from wildfire smoke before each shift and periodically thereafter by checking the AQI for PM 2.5 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 the AQI for PM 2.5 is 150 or lower.

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