Air emissions inventory

An air emissions inventory is an itemized list of the amount of air pollution (criteria, precursor, and hazardous air pollutants) from various sources. We calculate an air emissions inventory using EPA models, published emission factors, and other available information (such as population, permitted facilities, registered vehicles, and road activity). Greenhouse gases are included in a separate inventory.

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OPTION 1: Pollutants in the emissions inventory:

Ammonia (NH₃)
Carbon monoxide (CO)
Hazardous air pollutants
Nitrogen oxides (NO_x)
Particles (or particulate matter, PM)
Sulfur dioxide (SO₂)
Volatile organic compounds (VOCs)

OPTION 2: Pollutants in the emissions inventory:

Some criteria pollutants
Some precursor pollutants
- Ammonia (NH₃)
- Nitrogen oxides (NO_x)
- Volatile organic compounds (VOCs)
Hazardous air pollutants

Emissions inventory data is used for:

Air quality modeling
Air quality planning
Rulemaking
Public information
Pollution source fee updates
EPA reporting requirements

An emissions inventory is not based on air quality monitoring data used to enforce national air quality standards.

A point source emissions inventory is a database of individual inventories from commercial, industrial, and institutional (government buildings, hospitals, prisons, schools) facilities. These businesses have an air operating permit that requires yearly reporting of their criteria and hazardous pollutant emissions. For information about individual facilities, contact us or the local clean air agency in the county where the facility is located.

Prior years point source emissions data (spreadsheet)
Most recent point source emissions data (see map below)

A comprehensive emissions inventory estimates criteria pollutant emissions from all sources — transportation (vehicles, trains, ships, aircraft), wood stoves, outdoor and agricultural burning, wildfires, dust, and point sources. We publish this report every three years.

2017 Washington Comprehensive Emissions Inventory data and technical support document

A Prevention of Significant Deterioration (PSD) increment-modeling emissions inventory estimates the increased amount of air pollution an area is allowed. This prevents air quality in clean areas from getting much worse. A PSD increment-modeling emissions inventory includes:

Large Sources of Air Pollution

⬤ Chemicals production ⬤ Energy industry ⬤ Equipment manufacturing ⬤ Food processing ⬤ Forest products ⬤ Materials manufacturing ⬤ Metals processing ⬤ Oil refinery ⬤ Waste handling Go to the full map

Contact information

Farren Thorpe
Modeling & Emissions Inventory Scientist
airemissions@ecy.wa.gov
360-407-7658

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Air emissions inventory

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