Air Quality Reports, Studies, and Maps

Spokane Air Quality Data Reports: 

Where does air pollution come from in Spokane County?

The Washington State Department of Ecology conducts a comprehensive emissions inventory that estimates criteria pollutant emissions from all sources — transportation (vehicles, trains, ships, aircraft), wood stoves, outdoor and agricultural burning, wildfires, dust, and point sources. The inventory provides data for all Washington state counties.

Ecology publishes this report every three years. Click below for the most current inventory:

2017 Washington Comprehensive Emissions Inventory data and technical support document


Determining Attainment of Air Quality Standards:

When EPA sets or revises a national standard, Washington uses air monitoring data to determine if air quality in the state meets the new or revised standard. Based on this data, Washington can make recommendations to EPA about how to designate areas of the state. EPA will make the final decision about how to designate each area. Possible designations are: 

In the past, Spokane has been in nonattainment for both carbon monoxide (CO) and Particulate Matter (PM10). We are in attainment now and below are related attainment and maintenance plans. The Federal Clean Air Act requires states to develop plans for protecting and maintaining air quality in all areas of the state. It also requires states to develop specific plans for bringing nonattainment areas back into attainment. The plans are called State Implementation Plans (SIPs). Learn more about SIPs and see SIP documents.

Carbon Monoxide (CO)

Particulate Matter (PM10)