Smoke is measured in “μg/m3,” or micrograms per cubed meter. Here’s what the Environmental Protection Agency says you should do in different levels of ambient smoke.

0 - 15 μg/m3: Good air quality

No adverse health effects. No special action required.

16 - 40 μg/m3: Moderate air quality

Unusually sensitive people, such as those with severe asthma, should consider reducing prolonged or heavy exertion.

41 - 65 μg/m3: Air quality unhealthy for sensitive groups

People with respiratory or heart disease, the elderly and children should limit prolonged exertion.

66 - 150 μg/m3: Unhealthy air quality

People with respiratory or heart disease, the elderly and children should avoid prolonged exertion; everyone else should limit prolonged exertion.

151 - 250 μg/m3: Very unhealthy air quality

People with respiratory or heart disease, the elderly and children should avoid any outdoor activity; everyone else should avoid prolonged exertion.

251+ μg/m3: Hazardous air quality

Everyone should avoid any outdoor exertion; people with respiratory or heart disease, the elderly and children should remain indoors.

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