AP-42 Data and Air Permit Stack Test Requirements

If you use data from AP-42 to calculate particulate matter emissions, it is highly likely that this data represents only filterable particulate matter and no condensable particulate matter. As such, make sure any stack test requirements in your air permit reflect the same particulate matter basis that was used to estimate your emissions (i.e., filterable, condensable, or both). Otherwise, you might be comparing apples-to-oranges, which is less than desirable for compliance purposes.