Vulnerable groups are urged to avoid outdoor activity in multiple parts of southern California due to air pollution.

Wildfire smoke doesn’t just cloud the horizon, it can chemically change the air at ground level and in layers of the atmosphere miles above.

Wildfire smoke doesn’t just cloud the horizon, it can chemically change the air at ground level and in layers of the ...

Rio Blanco County officials lifted some mandatory evacuation and pre-evacuation orders Friday afternoon for the Elk and Lee ...

It’s among the wildfires that are raging in North America and Europe as climate change creates dangerous conditions, posing ...

Parts of Los Angeles County were evacuated in the early morning hours Friday after the fast-moving wildfire, named the Canyon ...

National Weather Service has issued heat advisories for Fox Valley and Green Bay areas and parts of the Northwoods.

Scorching hot temperatures, likely soaring into the triple digits, will settle across Denver and the Front Range -- ...

Amid thousands of evacuations and the spread of smoke to the United States, the Canadian armed forces and the Coast Guard ...

Smoke produced by hundreds of wildfires burning across Canada has drifted thousands of miles and nearly circled the entire ...

More smoke and heat is expected across the Pikes Peak Region Thursday as morning temperatures quickly rise, prompting another ...

The National Weather Service forecast indicates a dry and comfortable day with temperatures reaching the low 80s and light ...