Health officials from Minnesota to Maine have issued alerts warning of poor air quality from wildfires burning in Canada.

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

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.

Millions of Canadians were warned to limit their time outdoors on Sunday with wildfire smoke hanging in the air from B.C. to ...

The area reached the “very unhealthy” purple-colored range after being in the “unhealthy” red-colored range on the AirNow.gov website while the Packers took part in a 2-plus-hour practice outside on ...