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AP-42 is a compilation of air pollutant emission factors published by the U.S. Environmental Protection Agency (EPA). It provides standardized methods for estimating emissions from various industrial sources and activities. The calculation methods in AP-42 involve using specific emission factors, which are numerical values representing the amount of pollutant emitted per unit of activity, and applying them to relevant activity data to estimate total emissions. The document is widely used for regulatory compliance and air quality assessments.

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