The purpose of this document is to explain the sources of data included in the inventory. For each type of emissions, the document explains the data providers (such as the state, local, and tribal air agencies) that contributed data and provides more details about methods that the EPA uses to estimate those emissions.You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.
- 2014, Version 2 NEI Technical Support Document (TSD) (PDF)(414 pp, 10 MB)
- 2014, Version 1 NEI Technical Support Document (TSD) (PDF)(378 pp, 11 MB, December 2016)