The advisories impact large areas of Idaho, Oregon, Montana and Washington, lasting through the end of January.

Erin Davis/Axios Visuals Breathe easy, Philly, because our air quality is on the up and up. Why it matters: Long-term exposure to poor air quality is harmful to your health. State of play: The average ...

The air quality in the national capital improved and was recorded in the 'moderate' category on Friday morning.The ...

Toxic smoke and dangerous particulate pollution are spreading far beyond the flames, leaving air quality at unhealthy levels ...

Cleveland's Division of Air Quality has a new network of sensors acrosss the city to measure fine particulate in ...

Minimum temperature also saw a sharp drop of over 3 degrees Celsius due to the northwesterly winds that reached upto 30 kmph ...

On Sunday at 11:55 a.m. an updated air quality alert was issued in effect until Monday at noon. The alert is for San ...

As hazardous chemicals pollute the air after devastating wildfires, officials call for increased monitoring to protect ...

An air quality alert was issued on Thursday at 3:31 p.m. in effect until Friday at 7:15 a.m. The alert is for Burke Mountains ...

The Oregon Department of Environmental Quality issued an air quality advisory for Eastern Lane, Eastern Linn, Eastern Marion, ...

An air quality alert was issued on Tuesday at 5:03 a.m. for Josephine County.

Even with thick smoke coming from the Hughes Fire, skies have been clear in many areas, and the air quality forecast has been ...