Clean Air Indoors
Learn more about indoor air pollutants and steps you can take to improve your indoor air.
Indoor air can be 2-5 times, even up to 100 times, more polluted than outdoor air. Americans spend 90% of the time indoors. Poor air quality impacts everyone, but especially people with lung disease and other underlying health conditions. Whether we’re at home, work, school, it’s important to ensure the air we breathe indoors is as healthy as it can be. Learn more about indoor air pollutants and steps you can take to improve your indoor air.
Signs of Unhealthy Indoor Air
Learn how to know if there’s a problem with the air quality at your home, school, or work.
What Makes Indoor Air Unhealthy?
Learn about indoor air pollutants and sources of indoor air pollution.
Protect Yourself from Indoor Air Pollution
Learn how to keep sources of pollution out of your indoor spaces.
Indoor Air at Home, Work and School
Learn how to improve indoor air at home, school, and work.
Page last updated: April 8, 2026
