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

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

The ongoing Canadian wildfires have reportedly blanketed a third of the United States, affecting millions, with the National ...

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

PORTLAND, Maine (AP) — Smoke from Canadian wildfires worsened air quality in the eastern U.S. on Wednesday as several Midwestern states battled conditions deemed unhealthy by the federal government.

Proposed jobs and grants cuts by the Trump administration could have detrimental impacts in air quality monitoring at the ...

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 Canadian wildfires worsened air quality in the eastern U.S. on Wednesday as several Midwestern states battled conditions deemed unhealthy by the federal government. The fires have ...

Prescribed burns are important for land management and preventing wildfires, but a new study finds these managed fires are also significant contributors to air pollution in the southeastern United ...

MANITOBA, Canada — Air quality in some parts of the United States is worsening as smoke from dozens of wildfires in Canada travels south, pushed by winds high in the atmosphere.