Cheyenne, WY – The American Lung Association says Campbell and Sublette counties and Yellowstone National Park have seen days with ozone pollution in recent years.
The public-health advocacy group ranked the pollution levels of U.S. cities and counties based on air quality measurements that state and local agencies reported between 2005 and 2007.
The report released this week says Campbell County recorded four days of ozone pollution, Sublette three and Yellowstone one. The report considers Yellowstone part of Teton County and attributed the ozone reading to that county.
The report also ranked Cheyenne among the cities with the cleanest air in the nation.
Not all counties in Wyoming have the monitors necessary to measure air pollution, so the report doesn't cover the entire state.