Air quality monitoring network

Ecology, EPA, tribes, and local clean air agencies maintain a network of air monitoring stations to measure air pollution in Washington. Using continuous monitoring data, we let you know when air pollution reaches unhealthy levels. Based on this information, you can change your daily activities to reduce the amount of air pollution you're exposed to.


For current air monitoring data, look at the map below or go to the larger map with more features, Washington's Air Monitoring Network.

Monitoring Washington’s air quality

We use air monitoring data to:

  • Provide near real-time air quality information to protect health.
  • Determine if air quality meets health-based federal standards.
  • Forecast air quality.
  • Decide if burning will be allowed.
  • Help make air permitting decisions.
  • Evaluate the effectiveness of air pollution control programs.
  • Evaluate the effects of air pollution on public health.
  • Determine air quality trends.
  • Identify and develop responsible, cost-effective pollution control strategies.
  • Evaluate air quality models.

The network measures EPA’s list of the most serious health-related air pollutants:

The network also measures atmospheric data (wind speed and direction, temperature, relative humidity, and air pressure).

We use the Washington Air Quality Advisory (or WAQA) as a tool to advise people about air quality levels, when they are healthy or unhealthy. The air pollutants included in WAQA are the same as those listed above, except lead.