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.

From British Columbia to the Northwest Territories and all the way east to New Brunswick, air quality alerts have been issued ...

By Mitch Klein, Feven Gerezgiher and Juan Del Valle As result of severe wildfires in Canada, Minnesota is facing the longest air quality alert on record since the Minnesota Pollution Control Agency ...

Step outside and you'll probably smell it—smoke has been a major issue across much of Eastern Canada this weekend. Montreal ...

Wildfire smoke from Canada continues to linger across the state. An Air Quality Alert is still in effect throughout Wisconsin ...

"Wildfire smoke looks to persist throughout Michigan through at least Monday as winds shift," said state meteorologist Alec Kownacki.

The Pennsylvania Department of Environmental Protection declared a Code Orange Air Quality Action Day for particulate matter ...

Smoke from wildfires in Canada has forced officials to issue an air quality health advisory for New Yorkers. Department of Environmental Conservation and Department of Health officials declared a ...

Air quality alerts from Canadian wildfire smoke spread to the Northeast on Sunday, stretching as far as northern Maine. It comes as dry conditions fuel several wildfires out west, including the ...

The smoky air is predicted to reach New York City on Monday, and it could bring unhealthy air quality for sensitive groups.

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