Air quality conditions across several U.S. cities reached levels this week that federal agencies deem "unhealthy for sensitive groups," prompting health alerts and recommendations that children and ...

A series of live maps from Windy.com highlighted which parts of the U.S. were experiencing elevated levels of air pollution on Friday. The maps showed data for multiple types of pollutant, including ...

As wildfires spread across Canada, air quality in the U.S. continues to be impacted, and people sensitive to air pollution could face "serious health effects," according to a government website that ...