Ozone pollution isn’t just a summer story anymore. In parts of northern China, high ozone levels are now appearing during ...

Officials cautioned that ozone formation is a complex process with many factors, saying they cannot be sure that the hot fall was the driving factor in October’s exceedances.

Towering clouds of smoke sent into the stratosphere by ferocious wildfires can eat away at Earth’s ozone layer thanks to a potent mix of smoke, atmospheric chemistry and ultraviolet light, a new ...

Officials cautioned that ozone formation is a complex process with many factors, saying they cannot be sure that the hot fall was the driving factor in October’s exceedances.