WebFIRE is the United States Environmental Protection Agency's (EPA) online database that contains emissions factors for criteria and hazardous air pollutants (HAP) for industrial and non-industrial processes as well as reports submitted electronically to the EPA using the Compliance and Emissions Data Reporting Interface (CEDRI) in response to the electronic reporting requirements specified under parts 60, 62, and 63 of Title 40 of the U.S. Code of Federal Regulations (CFR). This presentation will give a general overview of the EPA's electronic reporting process, which includes CEDRI, the Electronic Reporting Tool (ERT) and WebFIRE. This presentation will also discuss major improvements made to the WebFIRE database, including the programming of the revised emissions factors development procedures into the database and the incorporation of existing AP-42 supporting documentation. This, combined with new data from test reports electronically submitted to EPA through CEDRI, has allowed for the ability to determine new as well as to revise existing emissions factors. This presentation will also highlight the emission factor proposal process and give an update on the new and revised emissions factors proposed by the EPA based on the statistical procedures outlined in the EPA’s Procedures for the Development of Emissions Factors from Stationary Sources.