| Sources of inhalable particulate matter (IPM) and extractable organic matter (EOM) fractions were identified and apportioned using a modified factor analysis/multiple regression (FA/MR) approach for Newark, N.J. In order to use FA/MR in a complex airshed such as Newark's, two new techniques were applied. The first was tracer source apportionment which permitted the use of FA/MR even when certain key tracers are emitted by more than one source. The second was the analysis of correlations between model residuals and the available components. Source contributions to IPM in the cities of Elizabeth and Camden, N.J. were also estimated by the improved FA/MR method and used to validate the Newark IPM model results. The Newark IPM and EOM model results were further validated by comparison with available source emission composition data, microinventory information, development of seasonal source apportionment models, comparison with modeling results obtained in other cities and application of the regression of principal component model.; The data used for the study consisted of 154 daily IPM and EOM samples collected at each of the three sampling sites. The IPM samples were analyzed for mass, Pb, Mn, Cd, Cu, V, Zn, Fe, Ni and total SO(,4)('-2) concentrations. The EOM samples were sequentially extracted with cyclohexane (CYC), dichloromethane (DCM) and acetone (ACE) into three fractions of increased polarity. Other relevant variables measured were the concentrations of several polycyclic aromatic hydrocarbons (PAH's), various vapor phase organic and inorganic compounds, and meteorology.; This research demonstrated that the tracer source apportionment-FA/MR method can be successfully used to apportion sources of inorganic and organic aerosol mass in areas where other methods of ambient aerosol modeling are of limited use due to the number and variety of the sources present and, in areas where public health concerns associated with mixtures of ambient pollutants are important. |
