Program Template photo identifier

Air Quality Program

Air Emissions Inventory

An air emissions inventory is an accounting of the amount of air pollution emitted by various sources. Every year, Ecology and the local air quality agencies inventory facilities with air operating permits. This is called a point source inventory. Every three years, Ecology inventories many additional sources such as motor vehicles, wood stoves, agriculture, outdoor burning, and natural sources. Several inventory summaries are available below.


Point Sources Annual Inventory

The point sources annual inventory is is a summary of individual inventories from facilities with air operating permits compiled by local air agencies and Ecology. Below is a summary of our most recent statewide point source emissions. The agency responsible for each facility is noted in the spreadsheet. Contact the local air agency or Ecology office for questions and the most up-to-date information about individual facilities. For more information and assistance with the annual inventory, please use the Major Point Source Emissions Inventory Assistance link.

Comprehensive three-year inventory

The comprehensive three-year inventory was developed by Ecology. It includes the point source inventory and many other source types such as motor vehicles, wood stoves, outdoor burning, agriculture, and natural sources. Summary data from the comprehensive emissions inventory as well as technical documentation are available below. If you need more information, please use the Contact Us link at the bottom of this page.

Prevention of Significant Deterioration (PSD) Modeling Inventory

The Prevention of Significant Deterioration (PSD) permit program was developed to prevent significant environmental impacts on attainment areas from large industrial sources of air pollution. The PSD Modeling Inventory zip file below includes minor source baseline dates by county and modeling data for those years, as well as detailed emissions inventory data. This information is useful for those performing a PSD analysis.

Other Links

Do you have questions or need more detail? Contact Us.


Small Business Assistance Links

PSD Permit Information

Air Operating Permits

Air Quality Data

Local Clean Air Agencies and Ecology Regional Offices