The American Lung Association “State of the Air” 2025 is the result of the hard work of many.

We would like to thank: Allen S. Lefohn, Ph.D., of A.S.L. and Associates, who compiled the data; John Balmes, M.D., who served as expert volunteer reviewer for the health impacts section. Special thanks this year goes to the air quality professionals who agreed to share stories about how the work they do makes a difference.

Great appreciation goes to the National Association of Clean Air Agencies, who strove to make this report better through comments, review and concerns. Many of its members reviewed and commented on their state data to verify their accuracy. We also appreciate the assistance of members of the Association of Air Pollution Control Agencies, some of whom also reviewed data from their states. We appreciate them all as our partners in the fight against air pollution. This results in this report should in no way be construed as a comment on the work any of these agencies do.  

“State of the Air” 2025 would not have been possible but for the first twenty formative years of inspiration, dedication and hard work of the late Janice E. Nolen. Her spirit still guides us all.

The American Lung Association assumes sole responsibility for the content of “State of the Air” 2025.

American Lung Association
55 W. Wacker Drive, Suite 1150
Chicago, IL 60601 

Advocacy Office 
1331 Pennsylvania Avenue, NW, Suite 1425 North
Washington, DC 20004
(800) 586-4872

Lung.org/sota

Copyright ©2025 by the American Lung Association.

American Lung Association and State of the Air are registered trademarks of the American Lung Association.

Did You Know?

  1. Nearly half of the people in the U.S. live where the air they breathe earned an F in “State of the Air” 2025.
  2. More than 156 million people live in counties that received an F for either ozone or particle pollution in “State of the Air” 2025.
  3. More than 42 million people live in counties that got an F for all three air pollution measures in “State of the Air” 2025.
  4. Breathing ozone irritates the lungs, resulting in inflammation—as if your lungs had a bad sunburn.
  5. Breathing in particle pollution can increase the risk of lung cancer.
  6. Particle pollution can cause early death and heart attacks, strokes, and emergency room visits.
  7. Particles in air pollution can be smaller than 1/30th the diameter of a human hair. When you inhale them, they are small enough to get past the body's natural defenses.
  8. Ozone and particle pollution are both linked to increased risk of premature birth and lower birth weight in newborns.
  9. If you live or work near a busy highway, traffic pollution may put you at greater risk of health harm.
  10. People who work or exercise outside face increased risk from the effects of air pollution.
  11. Millions of people are especially vulnerable to the effects of air pollution, including children, older adults, and people with lung diseases such as asthma and COPD.
  12. People of color and people with lower incomes are disproportionately affected by air pollution that puts them at higher risk for illness.
  13. Air pollution is a serious health threat. It can trigger asthma attacks, harm lung development in children, and even be deadly.
  14. You can protect yourself by checking the air quality forecast in your community and avoiding exercising or working outdoors when unhealthy air is expected.
  15. Climate change enhances conditions for ozone pollution to form and makes it harder to clean up communities where ozone levels are high.
  16. Climate change increases the risk of wildfires whose smoke spreads dangerous particle pollution.
  17. Policymakers at every level of government must take steps to clean the air their constituents breathe.
  18. The nation has the Clean Air Act to thank for decades of improvements in air quality. This landmark law has successfully driven pollution reduction for over 50 years.
  19. The U.S. Environmental Protection Agency is critical for cleaning up air pollution. EPA’s staff ensure that air pollution is monitored, write sound rules to clean it up, and make sure those rules are enforced.
  20. The U.S. Environmental Protection Agency is under threat. Despite EPA’s lifesaving role in protecting people’s health from air pollution, big staffing and funding cuts are endangering their work.
Get More Facts
Take Action

Page last updated: March 19, 2025