About Washington's air emissions inventory
An air emissions inventory is a thorough, detailed estimate of criteria pollutants, the individual substances that form the criteria pollutants (called criteria precursors), and hazardous air pollutants.
Every year, facilities that have an air operating permit must send their emissions data to us or local clean air agencies. This is called a point source inventory. These sources include large industrial facilities (pulp mills, airplane manufacturers, cement manufacturers, landfills, power plants) and airports, as well as smaller industrial and commercial facilities.
Every three years, we calculate emissions data from other smaller sources, such as motor vehicles, wood stoves, outdoor burning, agriculture, and natural sources.
We use the Washington Emissions Inventory Reporting System to collect the data. We obtain emissions data from:
- Counties: Adams, Asotin, Benton, Chelan, Columbia, Douglas, Ferry, Franklin, Garfield, Grant, Island, Kittitas, Klickitat, Lincoln, Okanogan, Pend Oreille, San Juan, Skagit, Spokane, Stevens, Walla Walla, Whatcom, Whitman, and Yakima.
- Pulp mills and aluminum smelters.
Facilities outside the counties listed above should contact a local clean air agency for emissions inventory reporting requirements.