Smoke from Canadian wildfires again plagued portions of the northern United States on July 16, prompting air quality alerts from Illinois to Maine.

Six members of Congress from Wisconsin and Minnesota have asked Canada to say how it plans to tackle the blazes and reduce ...

Much of the Upper Midwest continues dealing with swaths of unhealthy air because of drifting smoke from Canadian wildfires, covering the northern region of the U.S. at a time when people want to be ...

Canadian wildfire smoke returned to Wisconsin this weekend, with unhealthy levels for people with asthma and heart disease.

Wildfire smoke degrades air quality in swaths of Ontario, with Toronto ranking among the worst in the world on Monday.

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

The Dragon Bravo Fire has destroyed dozens of structures and a water treatment facility on the Grand Canyon's North Rim.

Smoke from wildfires burning in three Canadian provinces covered about a third of the U.S. on Wednesday, forecasters said, but had little effect on air quality except in New England and parts of ...

The amount of land burned this year is on pace to be the most since 1994, as 100 blazes roared on Friday across the central ...

Six Republican Congress members callously urged Canada to take “proper action” to mitigate smoke wafting into the U.S.

Smoke from Canadian wildfires is expected to drift into North Dakota again in coming days, potentially degrading air quality.

A lack of forest management and arson control is causing blazes that release hazardous fumes drifting into the Midwest, their ...