Smoke from Canadian wildfires is causing air quality concerns for millions of Americans in the Midwest and Northeast.

Residents of central Pennsylvania should prepare for hazy skies and reduced air quality today as wildfire smoke from Canada ...

An updated air quality alert was reported by the National Weather Service on Tuesday at 4:52 p.m. in effect until Thursday at ...

Pennsylvanians woke up to hazy skies again. Canadian wildfires sending smoke to the state triggered an air quality alert ...

Wildfire smoke has returned to Pennsylvania, but its impact on air quality so far is far less severe than what the region ...

Canadian wildfire smoke has worsened the air quality in multiple states and irritated the eyes, noses and throats of many ...

Air quality alerts are in place for portions of 10 states from Minnesota to Delaware as officials warn the smoke may become ...

Air quality alerts are in effect on Tuesday in 10 states as toxic smoke from hundreds of wildfires burning in Canada ...

Wildfire smoke will continue to linger and bring a haze to parts of the area Wednesday. Expect overall cloudy and muggy ...

Particularly north and west of the Lehigh Valley, anyone who might be especially vulnerable to the effects of air pollution ...

Smoke from ongoing wildfires across Canada continued to drift into parts of the United States on Wednesday, causing hazy skies and triggering air quality alerts in multiple states across the upper ...

Temperatures will be at or below average over the next few days, then 90s return early next week. We'll be watching wildfire ...