Página da Environmental Protection Agency sobre fatores de emissão
AP-42, Compilation of Air Pollutant Emissions Factors, has been
published since 1972 as the primary compilation of EPA's emissions
factor information. It contains emissions factors and process
information for more than 200 air pollution source categories. A source
category is a specific industry sector or group of similar emitting
sources. The emissions factors have been developed and compiled from
source test data, material balance studies, and engineering estimates.
The Fifth Edition of AP-42 was published in January 1995. Since then EPA
has published supplements and updates to the fifteen chapters available
in Volume I, Stationary Point and Area Sources. The latest
emissions factors are available below on this website. Use the AP 42
Chapter webpage links below to access the document by chapter.