Skip to main content
U.S. flag

An official website of the United States government

Here’s how you know

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

HTTPS

Secure .gov websites use HTTPS
A lock (LockA locked padlock) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

    • Environmental Topics
    • Air
    • Bed Bugs
    • Cancer
    • Chemicals, Toxics, and Pesticide
    • Emergency Response
    • Environmental Information by Location
    • Health
    • Land, Waste, and Cleanup
    • Lead
    • Mold
    • Radon
    • Research
    • Science Topics
    • Water Topics
    • A-Z Topic Index
    • Laws & Regulations
    • By Business Sector
    • By Topic
    • Compliance
    • Enforcement
    • Laws and Executive Orders
    • Regulations
    • Report a Violation
    • Environmental Violations
    • Fraud, Waste or Abuse
    • About EPA
    • Our Mission and What We Do
    • Headquarters Offices
    • Regional Offices
    • Labs and Research Centers
    • Planning, Budget, and Results
    • Organization Chart
    • EPA History

Indoor Air Quality (IAQ)

  • Test your nest for radon

    Radon is invisible - you can't see or smell it, but it can be deadly. Take action against the second leading cause of lung cancer. Test your home for radon today!

    Find a radon test kit
     

  • New ASHRAE Guideline for Wildfire Smoke

    The new ASHRAE Guideline 44 recommends measures to protect building occupants from smoke during wildfire and prescribed burn events.

    Learn about the Guideline
     

  • Was your home in a flood?

    Flood water can make the air in your home unhealthy. Mold can grow on wood, drywall, carpet and furniture if they remain wet for more than 24 hours. 

    Learn about flood cleanup

  • Wildfires could impact your indoor air quality

    Learn how to reduce your exposure to wildfire smoke inside your home.

Did You Know...

We spend about 90% of our time indoors? Indoor Air Quality impacts everyone, including those who may be more vulnerable - children, the elderly, and people with health conditions like asthma and heart disease. Learn how source control, ventilation and filtration can reduce exposure to indoor pollutants and improve indoor air quality.

  • Learn About IAQ

    learn about indoor air quality

    Learn about indoor air quality and ways to improve it where we live, learn, work and play.

    Learn about IAQ
  • IAQ by Building Type

    Image of a cityscape with different types of building and single family homes

    Learn about indoor air quality in different building types.

    Learn about IAQ by building type
  • Indoor Pollutants and Sources

    image of a kitchen, living room, and dining room areas

    What's in your indoor air? Learn about indoor air pollutants and sources.

    Learn about indoor pollutants and sources
  • IAQ Science and Technologies

    kitchen that can be ran from apps on a cell phone

    Learn about indoor air science and technologies used to help improve indoor air quality.

    Learn about IAQ science and technologies
  • Networking and Funding

    image of people networking

    Discover indoor air quality networking and funding opportunities.

    Find networking and funding opportunities
  • Upcoming Events and Resources

    blurred image of an appointment book

    Find a calendar of events, links to Indoor air-related webinars and helpful resources.

    Find events, webinars and resources
trending topics

IAQ Topics in the Spotlight

See trending IAQ topics and get the information you need to improve your indoor air quality.

How to safely place a generator outside away from buildings

Publications about IAQ

Find IAQ-related publications, factsheets, and infographics.

frequently asked questions

Frequently Asked Questions

Find answers to your IAQ-related questions.

Map of the US, split into EPA regions

EPA Regional and State Contacts

Find contact information for EPA's 10 regional offices and state IAQ information.

Related IAQ Topics

  • Asthma
  • Mold
  • Radon
  • IAQ in Schools
  • Indoor AirPlus
  • Emergencies and IAQ
  • Indoor Air and Coronavirus (COVID-19)
  • Calidad del air interior

Stay Informed!

Subscribe to Email List

Subscribe to Indoor Air Quality Email Updates

Contact Us to ask a question, provide feedback, or report a problem.
Last updated on March 3, 2025
  • Assistance
  • Spanish
  • Arabic
  • Chinese (simplified)
  • Chinese (traditional)
  • French
  • Haitian Creole
  • Korean
  • Portuguese
  • Russian
  • Tagalog
  • Vietnamese
United States Environmental Protection Agency

Discover.

  • Accessibility Statement
  • Budget & Performance
  • Contracting
  • EPA www Web Snapshot
  • Grants
  • No FEAR Act Data
  • Plain Writing
  • Privacy
  • Privacy and Security Notice

Connect.

  • Data
  • Inspector General
  • Jobs
  • Newsroom
  • Regulations.gov
  • Subscribe
  • USA.gov
  • White House

Ask.

  • Contact EPA
  • EPA Disclaimers
  • Hotlines
  • FOIA Requests
  • Frequent Questions
  • Site Feedback

Follow.