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Emission Inventory Related Codes

Explanation of File Formats
Source Classification Codes (SCC) - May 2007

North American Industry Classification System (NAICS)

NAICS codes are available from the following sources:

US EPA Environmental Data Registry Code Sets

Code Sets contain permissible values, value meaning names, and value meaning definitions that can be used in application development. Some of these Code Sets are related to EPA data standards.

US EPA Tier Categories

    Source Classification Codes to Tier Category Relationship for Emission Inventories
    - June 30, 2005

Data Source Codes for the 2002 National Emission Inventory, Nov 27, 2006, Version 2

Data Source Codes Spreadsheet (XLS 30K) this file contains the data source codes for all sectors of the 2002 NEI. These codes indicate where the data came from.

Federal Information Processing Standards (FIPS)

Please refer to the National Emissions Inventory Input Format (NIF) web page for information. The state and county FIPS codes are in the NIF 3.0 Code Tables In MS Excel (revised November 2003)

Standard Industrial Classification (SIC)

Below are some useful links that provide SIC information.

NOTE: The Standard Industrial Classification (SIC) coding system has been superseded by the NAICS coding system. The links below are available for historical purposes only.

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


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