Over the last decade, wildfires have worsened ground-level ozone pollution across much of the contiguous United States, creating unhealthy air far from active flames.

A new study finds that smoke from larger wildfires is reversing more than a decade of American improvements in smog

A new study finds that smoke from larger wildfires is reversing more than a decade of American improvements in smog

Over the last decade, wildfires have worsened ground-level ozone pollution across much of the contiguous United States, creating unhealthy air far from active flames.

Destructive fires has undone years of efforts to reduce ozone levels, underscoring a growing public health crisis