Smoke from Canadian wildfires is causing air quality concerns for millions of Americans in the Midwest and Northeast.  Air ...

The Bay Area Air District has issued an air quality advisory in the region for Tuesday because of smoke from a wildfire in ...

Smoke from hundreds of wildfires in Canada is lingering over the northern U.S., spreading across to roughly a dozen states ...

Researchers found that wildfire smoke can raise ozone to dangerous levels, posing hidden health risks even in remote areas.

Winds could blow smoke from the Bear Gulch fire burning on the Olympic Peninsula, bringing the potential for unhealthy air ...

While the smoke is worst along the Western Slope where the fires are burning, levels are also fluctuating on the Front Range.

Canadian wildfires burning across northern Manitoba and Saskatchewan are sending smoke through central Canada, the Great ...

The city is racing to put up 277 sensors. Once installed, Chicago will have the most high-quality air monitors in the country ...

Across the state, Oregon’s air is getting harder to breathe. The number of days the air quality index was unhealthy for ...

Wildfire smoke from the Bear Gulch Fire could create “unhealthy or hazardous” air quality conditions in Mason County over the ...

An air quality alert is in effect for all of Massachusetts as smoke from Canadian wildfires descends into the Boston area.

Air quality alerts are in place again for the entire Western Slope as firefighters battle more than 20 fires. The Colorado ...