Smoke from wildfires in eastern Canada is flowing across the U.S. East Coast, triggering air quality alerts in the hazardous category in some areas.But what do those air quality alerts mean?The color-coded Air Quality Index categories you'll find on the Environmental Protection Agency's AirNow website rank air quality on a 500-point scale and are meant to give the public an easy way to understand the health effects of the air around them daily.
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