smog

National Park Service

More and more Americans are living in places where the air is dangerous to breath. That's because of smog or smoke from wildfires. A new study says climate change is the culprit.

How ozone is made
American Lung Association

Wyoming's Department of Environmental Quality (DEQ) announced an ozone action day in the Upper Green River Basin for March 19. That means ozone, a secondary pollutant that can cause respiratory issues, could exceed the federal limit in the area: Sublette, Lincoln and Sweetwater counties.