Emissions Inventory | Region 10 | US EPA

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Emissions Inventory

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Background

EPA's Emission Factor and Inventory Group (EPA/OAR/OAQPS/EMAD/EFIG) prepares a national database of air emissions information with input from numerous State and local air agencies, from tribes, and from industry. This database contains information on stationary and mobile sources that emit criteria air pollutants and their precursors, as well as hazardous air pollutants (HAPs). The database includes estimates of annual emissions, by source, of air pollutants in each area of the country, on an annual basis. The NEI includes emission estimates for all 50 States, the District of Columbia, Puerto Rico, and the Virgin Islands. Emission estimates for individual point or major sources facilities), as well as county level estimates for area, mobile and other sources, are available currently for years 1985 through 1999 for criteria pollutants, and for years 1996 and 1999 for HAPs.

Data from the NEI are used for air dispersion modeling, regional strategy development, regulation setting, air toxics risk assessment, and tracking trends in emissions over time. For emission inventories prior to 1999, criteria pollutant emission stimates were maintained in the National Emission Trends (NET) database and HAP emission estimates were maintained in the National Toxics Inventory (NTI) database. Beginning with 1999, criteria and HAP emissions data are being prepared in a more integrated fashion in the National Emission Inventory (NEI), which takes the place of the NET and the NTI.
For more information on the Naitonal Emission Inventory, see the EPA Emissions Inventory Homepage Region 10Emissions Page Emissions Definitions

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URL: http://yosemite.epa.gov/R10/AIRPAGE.NSF/Air+Toxics/EmissionsInventory

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