Air Quality Data

When air pollution is present, postpone or limit outdoor activities until air quality is improved, especially if you have asthma or other lung or heart diseases. Search WTN data to find information (tables, charts and maps) on air quality and other related data, such as asthma, heart attacks, and cancer.

Why is outdoor air pollution data important?

  • Two of the six air pollutants monitored by the Environmental Protection Agency (EPA) are widespread pollutants in Washington State. These are fine particulate matter (PM2.5) and ground-level ozone (ozone).

    • PM2.5 is smaller than 1/30 the width of one piece of your hair. The particles are so small that they can be breathed deep into the lung and cause serious illness and sometimes death.
    • Ozone, the main component of smog, can irritate and inflame the lungs and eventually change how well they work.

View the Data

Air Quality Data

Air Quality Data

Reduce Exposure

To learn more about air quality, your health, and reducing exposure, visit our Outdoor Air Quality webpage. View current wildfire and smoke conditions.

Additional Resources

Air Pollution and School Activities Guide (PDF)

Asthma Program

Cancer Program

Health of Washington State Report (PDF)

Outdoor Air

Smoke from Fires

Surveillance Investigation of the Cardiopulmonary Health Effects of the 2012 Wildfires in North Central Washington State (PDF)

Air Now - Wildfires and Air Quality

American Heart Association

Ecology Air Program

Outdoor Air - CDC

Protect Yourself From Wildfire Smoke

Smoke From Fires (PDF)

Contact Us

For information or questions related to the Washington Tracking Network, email

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We love hearing about how our data is being used to make an impact on the health of Washingtonians. It also helps us to know what is meeting our users’ needs and how we can improve the information we provide. If you used our data, please tell us about it by sending an email to

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