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

Despite thick smoke in the sky today in southern Colorado, air quality alerts haven't been issued - instead they've been in the western slope. In fact - sometimes invisible compounds pose more risk.

An air quality alert was issued by the National Weather Service in Mount Holly at 9:43 a.m. on Friday, Aug. 15.

An air quality alert was reported by the National Weather Service on Tuesday at 12:17 p.m. in effect until 8 p.m. for ...

An air quality alert was reported by the National Weather Service on Tuesday at 9:10 a.m. in effect until 11 p.m. for Western ...

On Saturday at 3:45 p.m. an air quality alert was reported by the National Weather Service in effect until Monday at midnight ...

The National Weather Service reported an air quality alert at 8:43 a.m. on Monday in effect until 11 p.m. for Northern ...

The National Weather Service reported an air quality alert at 12:43 p.m. EDT on Sunday in effect until Tuesday at noon EDT ...