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Criteria Pollutant Emissions Summary Files

September 20, 2005: Summary files have been generated from the EPA's national emissions inventory (NEI) database for criteria air pollutants for the years 1990 and 1996 through 2001. The files are in ASCII text format and have been compressed. Each year includes five data files and a readme file that explains the file structure.

Detailed emissions data is available from the 1999 national emissions inventory and the draft 2002 national emissions inventory. For years prior to 1990, and for the years 1991 through 1995, the NEI database contains trends level data. This data is available in the annual air pollutant emissions trends report for 1970 through 2002.

Criteria Pollutant Emissions Summary Files: (FTP Site)

| Office of Air Quality Planning & Standards | Technology Transfer Network |
| Clearinghouse for Inventories & Emissions Factors |

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