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AP-42: Compilation of Air Emissions Factors from Stationary Sources

Description

AP-42, Compilation of Air Pollutant Emissions Factors from Stationary Sources, 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 latest emissions factors are available below on this website. Use the AP-42 Chapter webpage links below to access the document by chapter. Emission factors are being updated as data are received and evaluated.

Questions this resource can help answer

How do specific sources (e.g. EGUs, factories) contributed to the overall mixture of air pollutants in my city? Which are the biggest drivers of 'X' air pollution?

How do I use this resource?

Emission factors may be appropriate to use in various situations such as making source-specific emission estimates for area-wide inventories. These inventories have many purposes, including ambient dispersion modeling and analysis, control strategy development, and in-screening sources for compliance investigations.

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