The Importance of PM10/2.5 Emissions
AUTHOR: Lesley L Sloss
DATE: October 2004
Increasing attention is being given to fine particulates as a cause of human respiratory and cardiac problems and reduced atmospheric visibility. This has prompted development of ambient air quality standards for PM10 and more recently PM2.5 in the United States, Canada, and other countries. To understand the contribution of stationary sources to ambient PM2.5, data on the mass and chemical composition of primary PM2.5 emissions are needed.
Emission data are also needed for gaseous PM2.5 precursors, for example SO2, NOx, ammonia and volatile organic compounds (VOC). Once a complete inventory of chemicallyspeciated source emissions is established, source apportionment techniques can be used to identify significant contributors to PM2.5 and to evaluate the effectiveness of source control strategies. Control technologies are available which can reduce emissions of fine particles and the precursors of secondary particulates. However, the complex chemistry of these fine particulates means that is not clear whether these control technologies will achieve the reductions required.