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 ...

This new wave of air quality alerts comes after Canadian wildfires prompted a slew of similar ones across the upper Midwest earlier this summer. Wildfires, blowing dust and ozone are all sources of ...

Nearly half of Americans in the U.S. live in areas with failing air quality, according to the American Lung Association’s annual State of the Air report. Experts warn the nation’s air pollution crisis ...

Worsening ozone levels can be attributed to smoke from wildfires in Canada in 2023 and higher temperatures combined with emissions in the South. The American Lung Association found that 156.1 million ...

Getting your Trinity Audio player ready... The Front Range’s summer ozone pollution season begins Sunday and with it comes the annual warnings about being careful when working or playing outdoors on ...

Images of California’s wildfires this winter speak for themselves about the fires’ devastating effects. But those pictures don’t tell the whole story. Together with soil emissions, the fires are ...

In the stratosphere, ozone acts as a protective layer. But in the troposphere, at ground level, this colorless gas is incredibly harmful to human health and the environment in ways scientists are ...

Ozone pollution isn’t just a summer story anymore. In parts of northern China, high ozone levels are now appearing during winter—an alarming twist that defies decades of air quality science. This ...

Add Yahoo as a preferred source to see more of our stories on Google. The Los Angeles metro is once again the worst for ozone in the nation, a harmful pollutant and “main ingredient in smog” that ...