Air Quality - Washington Tracking Network (WTN)

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 should I be concerned about outdoor air pollution?

  • 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.


Department of Health
More Resources

Contact Us

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

Would you like to receive updates?

Receive updates and information about WTN by joining our email newsletter.



National Environmental Public Health Tracking Program