The Agency monitors air pollution across King, Kitsap, Pierce, and Snohomish Counties. We focus on fine particle pollution because of its health impacts. For current fine particle levels, please visit our Sensor Map.   

For an annual summary of all pollutants measured in our four counties, please see our most recent data summary.   

In addition to our core monitoring network, the Agency also deploys small air quality sensors. For more information on sensors, see Air Quality Sensors page. 

Please visit our Air Quality Data pages to see past and present air quality data.