WebFIRE is EPA’s online emissions factor repository, retrieval, and development tool. The WebFIRE database contains EPA’s recommended emissions factors for criteria and hazardous air pollutants (HAP) for industrial and non-industrial processes. In addition, WebFIRE contains the individual data values used to develop the recommended factors and other data submitted to EPA by federal, state, tribal, and local agencies; consultants; and industries. For each recommended emissions factor and individual data value, WebFIRE contains descriptive information such as industry and source category type, control device information, the pollutants emitted, and supporting documentation.

WebFIRE includes data submitted to EPA from the Electronic Reporting Tool (ERT). Beginning January 1, 2012, industries are required to submit their source test data to EPA using the ERT application. This information is shared with WebFIRE and is available to the public. More information about the ERT data is available on the Search WebFIRE page.

Information about updates, changes or enhancements to the system, and Frequently Asked Questions (FAQs) will be posted on this page.

Related Information

To assist State and local agencies in compiling data that is needed for purposes of developing the National Emissions Inventory (NEI), EPA developed emissions factors for Electric Generating Units (EGUs). These emissions factors were developed using about 200 of the over 400 stack test data that were collected as part of the Information Collection Requests (ICR’s) issued as part of the development of the Mercury and Air Toxics Standards (MATS) Rule. These factors were derived using an early version of EPA’s Draft 2013 Recommended Procedures for Development of Emissions Factors. These emissions factors have NOT gone through EPA public comment and review and therefore, should NOT be used for any purpose other than for development of the NEI. These factors are available at this link MATs emissions factors (XLSX 563 K) NOTE: Click on the "OPEN" button and it will take a few minutes to open.

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