On extractable organic matter (EOM) be used as a motor vehicle tracer in multivariate air quality receptor models?

Summertime data collected at two New Jersey sites during the Airborne Toxic Element and Organic Substances (ATEOS) project was used to develop a replacement tracer for Pb from motor vehicle particulate emissions. The Elizabeth and Camden, New Jersey data were analyzed using principal factor analysis (PFA) with varimax rotation and multiple regression models were developed to predict inhalable particulate (D50<15 um) mass (IPM). Dichloromethane‐soluble organics (DCM) proved to be the best tracer for motor vehicles in this analysis. By using DCM as a motor vehicle tracer the selected models predicted that 14–25% of IPM resulted from this source category.