The Maui fire was directly blamed for more than 100 deaths. But it also left 1 in 5 with lung damage and as many as half with ...

In Grand Rapids, the Air Quality Index, which measures particle pollution in the air, was over 100 AQI six of the last seven ...

As Canada grapples with one of its worst wildfire seasons on record, smoke from the blazes have prompted air quality alerts across the U.S.