The poor air quality is, in large part, due to particulate matter, known as PM2.5, released from smoke, fire and other sources of pollution such as power plants, cars and trucks.

The U.S. has one of the world’s most advanced systems to monitor air pollutants. Can it keep up with a changing climate?

Recent wildfires in the Northstate, particularly the Green Fire burning in the Montgomery Creek mountainous area of Shasta ...

An air quality map shows conditions improving in the U.S. on Friday as smoke from the Canadian wildfires subsides.

Wildfire smoke increases indoors activity, raising the risk for airborne disease transmission such as influenza and COVID-19, ...

Air quality and your health: Breathing in wildfire smoke is bad for your health. The EPA uses a color-coded system to measure air quality — here’s what Code Red, Code Purple and more mean .

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Air quality remained poor in the Northeast on Friday, but conditions were improving across much of the Midwest as rain and winds from the west and south began to disperse wildfire smoke from ...

Dozens of wildfires are burning in the Canadian province of Québec, and the smoke is so bad that it's causing air quality problems across large swaths of the U.S.

MIchigan's air quality will be unhealthy for some groups Saturday. Check the air quality index map to see if it's good or bad ...

A special air quality statement is in effect for most of Manitoba as wildfire smoke leads to poor air quality and reduced ...

What to Know About Canadian Wildfires and U.S. Air Quality The ongoing outbreak of fires in Canada is sending new waves of smoke into the American Midwest, and the pollution has been seen as far ...