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

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

A gray haze from wildfire smoke could be seen in Cincinnati, and the entire state of Minnesota is under an air quality alert.

Many fires burning across Canada, forcing evacuations and threatening air quality in the United States, cannot simply be put out, authorities and experts say.

Smoke from the Canadian wildfires continues to bring potentially dangerous air quality to parts of the northern U.S., with ...

Continued drifting of wildfire smoke from Canada and Alaska has prompted Bay Area air regulators to extend an air quality ...

Wildfires have been raging along the West Coast and in Canada for most of the spring and summer. For some U.S. residents, ...

Early one October afternoon in 2023, thick gray smoke drifted across Sheffield's western skyline. As much of the city became ...

Recent, out-of-control wildfires in Canada are bringing hazy, dangerous air to American communities, prompting air quality alerts and advisories in multiple states nationwide. With the size and number ...

The Bay Area Air District on Sunday morning issued an air quality advisory due to possible wildfire smoke from Canada and ...

The Trump administration's proposed EPA budget cuts and staff reductions threaten the agency’s capacity to monitor and ...

The Bay Area Air District on yesterday morning issued an air quality advisory due to possible wildfire smoke from Canada and ...