This website uses cookies. By continuing you are agreeing to our privacy policy.

Wyoming Cities Rank as Some of the Cleanest in the Nation

A new report lists Cheyenne and Casper as having some of the best air quality in the U.S

(April 18, 2018) - CHEYENNE, WY

For more information please contact:

Holly Harvey
[email protected]
(206) 512-3292

The American Lung Association’s State of the Air 2018 report shows that Wyoming continues to have some of the best air quality in the nation. The trends reported in this year’s report, which covers data collected by states, cities, counties, tribes and federal agencies in 2014-2016, reflect the ongoing challenges to reduce each pollutant in the changing political and outdoor climate.

For the first time, the city of Casper was named to all three of the cleanest cities lists for ozone, year-round particle pollution, and short-term particle pollution. It’s also ranked as the number three cleanest city for year-round particle pollution.

The city of Cheyenne ranks as the number one cleanest city for year-round particle pollution and is one of the cleanest cities for short-term particle pollution.

“Across the nation and in Wyoming, the report found continued improvement in air quality, but still, more than four in 10 Americans – 133.9 million – live in counties that have unhealthful levels of either ozone or particle pollution, where their health is at risk,” said Carrie Nyssen. “Unhealthful levels of pollution put citizens at risk for premature death and other serious health effects such as asthma attacks and greater difficulty breathing for those living with a lung disease like COPD.”

Each year the State of the Air report provides a report card on the two most widespread outdoor air pollutants, ozone pollution, also known as smog, and particle pollution, also called soot. The report analyzes particle pollution in two ways: through average annual particle pollution levels and short-term spikes in particle pollution. Both ozone and particle pollution are dangerous to public health and can increase the risk of premature death and other serious health effects such as lung cancer, asthma attacks, cardiovascular damage, and developmental and reproductive harm.

“We can and should do more to save lives,” Carrie Nyssen said. “The Lung Association in calls on our members of Congress to defend the Clean Air Act, currently under threat from those who want to weaken this effective public health law. We also call on the U.S. Environmental Protection Agency to implement and enforce the law instead of trying to roll back major safeguards like the Clean Power Plan and cleaner cars, both steps that help us fight climate change and reduce air pollution.” 

Climate change is worsening our air pollution problems, as the State of the Air 2018 report shows. Warmer temperatures linked to climate change increase the frequency and severity of ozone days and make it harder to reach our clean air goals. Climate change is also linked to extreme weather patterns, drought and wildfires, which contribute to increased particle pollution.

“With record-setting heat in 2016, high ozone days increased dramatically which puts millions more people at risk.” Nyssen said. “This also puts creates challenges to the work cities are doing across the nation to clean up.”

For more information about Wyoming’s local air quality data and grades for each county and metropolitan area, visit For media interested in speaking with an expert, please contact Holly Harvey at the American Lung Association of the Mountain Pacific at (206) 512-3292 or [email protected].



About the American Lung Association

The American Lung Association is the leading organization working to save lives by improving lung health and preventing lung disease, through research, education and advocacy. The work of the American Lung Association is focused on four strategic imperatives: to defeat lung cancer; to improve the air we breathe; to reduce the burden of lung disease on individuals and their families; and to eliminate tobacco use and tobacco-related diseases. For more information about the American Lung Association, a holder of the coveted 4-star rating from Charity Navigator and a Gold-Level GuideStar Member, or to support the work it does, call 1-800-LUNGUSA (1-800-586-4872) or visit:

Red button with telephone
Ask An Expert

Questions about your lung health? Need help finding healthcare? Call 1-800-LUNGUSA.

Get help
Red button of two hand prints
We need your generous support

Make a difference by delivering research, education and advocacy to those impacted by lung disease.

Button of turquoise LUNG FORCE swirl

LUNG FORCE unites women and their loved ones across the country to stand together in the fight against lung cancer.

Get involved
Join the fight for healthy lungs and healthy air.
Donate Now.