AP-42 factors for open molding were rescinded because they significantly underestimated emissions from the FRP layup facilities.
OAR develops national programs, technical policies, and regulations for air pollution control.
EPA Region V - EPA divides the country into ten regions. In addition, the TTN serves as a public forum for the exchange of technical information and ideas among participants and EPA staff. It serves as EPA's central clearinghouse for the latest information on air emission inventories and emission factors. It has the latest version of AP-42, as well as draft sections, available for downloading. The latest air models and supporting documentation is available here to download.