Abstract
Measurements were made of aerosol chemical composition, related gaseous precursors and meteorological parameters at an urban New York site and a semi-rural site on Long Island during summer and winter seasons. Statistical evaluation of seasonal and urban-rural variations in the data reveal strong support for the hypothesis that urban aerosol composition and concentration are principally the result of local emissions in the winter season, but are impacted in a major way by long-distance transport of aerosols and precursors in the summer season. The supporting data include the sulfate wind directional patterns and seasonal variations in the sulfate-SO 2 correlations at both sites. These are supplemented by inferences made from factor analysis of aerometric variables made at both sites for winter and summer seasons. Implications of these results with regard to emission control strategies are outlined.
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