What are the definitions of the different types of particulate matter?
Particulate matter (PM) is all finely divided solid or liquid material, other than uncombined water, emitted to the ambient air, inclusive of all particle sizes capable of being airborne. Total Suspended Particulate (TSP) is the portion of PM that has become airborne and has an aerodynamic diameter less than or equal to about 100 micrometers. PM10 is the portion of PM with an aerodynamic diameter less than or equal to 10 micrometers. PM2.5 is the portion of PM that has an aerodynamic diameter less than or equal to 2.5 micrometers and is most health offensive. Primary particulate matter is composed of two components: filterable PM and condensable PM. Filterable PM includes particles directly emitted by a source as a solid or liquid at stack or release conditions and captured on the filter of a stack test train. Condensable PM is material that is vapor phase at stack conditions, but which condenses and/or reacts upon cooling and dilution in the ambient air to form solid or liquid PM imme
