“Air quality and visibility due to wildfire smoke can fluctuate over short distances and can vary considerably from hour to ...

Smoke from wildfires blazing across Canada is once again wafting over huge portions of the U.S. Midwest and worsening air ...

The smoke is expected to remain over the northern and central Plains of the United States for the next couple of days, ...

The Iowa Department of Natural Resources reported Friday that air quality in Iowa will be at levels “unhealthy for sensitive ...

The state of Minnesota is entering another in a long string of summer days marred by air quality alerts. Poor air quality ...

The Midwest saw some of the worst air quality conditions in the world Thursday, and similar conditions are expected to ...

Chicago air quality remains in the top five worst in the world Friday with an Air Quality Alert in place from Canadian ...

Smoke and grit from hundreds of forest fires have spread across large parts of Canada and the northern US, sending air quality across the Midwest and northeast US and Toronto to unhealthy levels.

Smoke from Canadian wildfires prompted a special air‑quality statement for Toronto and warnings nationwide, urging residents to limit outdoor time amid poor air and hazy skies.

The elevated levels of fine particulate matter resulting from wildfire smoke could present significant health risks.

Wildfire smoke from the Prairies prompted special air quality statements and warnings across the country Saturday.

The National Weather Service has opted to extend an air quality alert in the Chicago area for another day.