air quality

This is the latest in a series of intense wildfire seasons in Canada — and smoky springs and summers in the Midwest.

Dry conditions and high winds are driving Canada’s wildfires, following the country’s warmest winter on record and forcing thousands of people to evacuate.

The EPA has handed down a clear message to Michigan: your air is not clear. The agency says too many people are living in areas with unacceptable smog...

Air quality has gotten better in the U.S. over the last several decades. But more recently, nitrogen oxide and carbon monoxide emissions have not been...