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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 clean air 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, outdoor burning, agriculture, and natural sources. Several inventory summaries are available below.

Point Sources Annual Inventory

The point source annual inventory is a summary of individual inventories from facilities with air operating permits. Below is a summary of the most recent statewide point source emissions. The agency responsible for each facility is noted in the spreadsheet. Contact the local clean air agency or Ecology office for the most up-to-date information about individual facilities. For more information about the annual inventory, click on the Major Point Source Emissions Inventory Assistance link below.

Comprehensive Three-Year Inventory

Ecology developed the comprehensive three-year inventory. 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 is available below. For more information, use the Contact Us link below.

Prevention of Significant Deterioration (PSD) Modeling Inventory

The Prevention of Significant Deterioration (PSD) permit program was developed to prevent significant environmental impacts to attainment areas (a location that meets federal air quality standards) from large industrial sources of air pollution. The PSD Modeling Inventory file below includes minor source baseline dates by county and modeling data for those years, as well as the most recent year's detailed emissions inventory data. This information is useful for those performing a PSD analysis. The most recent year's data for facilities under the jurisdiction of Olympic Region Clean Air Agency, Puget Sound Clean Air Agency, or Southwest Clean Air Agency are not included in the file below. Contact those agencies if you need information for PSD modeling.

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Small Business Assistance

Prevention of Significant Deterioration (PSD) Permit Information

Air Operating Permits

Air Monitoring

Local Clean Air Agencies