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

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

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

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

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

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

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

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

The Mount Underwood fire near Port Alberni continues to grow, and many on Vancouver Island are feeling the impact. Island ...

Learn more about wildfires and smoke dangers in these visual stories: Foreign dust-up: Canadian smoke, Saharan dust will cover U.S. together Canadian wildfire smoke is fouling U.S. air quality.

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