Air emissions inventory summaries

Facilities that have an air operating permit must send their emissions data to us or local clean air agencies. We collect emissions data through the Washington Emissions Inventory Reporting System (WEIRS) to find out how much pollution is in the air and to track the data.

Air emissions inventory

An air emissions inventory is an accounting of the amount of air pollution from various sources. Every year, Ecology and local clean air agencies conduct an inventory of facilities that have an air operating permit. This is called a point source inventory. Every three years, we count other emission sources and issue a comprehensive inventory.

Point source annual inventory

The point source annual inventory is a summary of individual inventories from facilities that have an air operating permit. Contact us or the local clean air agency for the most up-to-date information about individual facilities. Facilities with an air operating permit must report annually.

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Comprehensive emissions inventory

We publish a comprehensive emissions inventory every three years that includes a point source inventory and other emission sources such as transportation (vehicles, boats, trains), wood stoves, outdoor burning, agriculture, wildfires, and dust. See the most recent summary data from the comprehensive emissions inventory as well as a technical support document and a quick reference.

Prevention of Significant Deterioration modeling inventory

The Prevention of Significant Deterioration (PSD) permit program was developed to prevent significant environmental impacts to an attainment area (a location that meets federal air quality standards) from large industrial sources of air pollution. The Prevention of Significant Deterioration modeling inventory 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 conducting a Prevention of Significant Deterioration analysis.