National Emissions Inventory (NEI)

The National Emissions Inventory (NEI) is a comprehensive and detailed estimate of air emissions of both Criteria and Hazardous air pollutants from all air emissions sources. The NEI is prepared every three years by the US EPA based primarily upon emission estimates and emission model inputs provided by State, Local, and Tribal air agencies for sources in their jurisdictions, and supplemented by data developed by the USEPA. Click the following link to visit the NEI site or download NEI data:

Source:U.S. Environmental Protection Agency. 2011. Technology Transfer Network Clearinghouse for Inventories & Emission Factors. Accessed on 29 September 2011. Available at