Contribution of Mobile Sources to Ambient Particulate Concentrations in a Downtown Urban Area

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Abstract
In response to the Clean Air Act Amendments of 1977, new State Implementation Plans are being developed for attaining primary ambient air quality standards for total suspended particulates (TSP). The significance of “nontraditional” sources to the levels of TSP is receiving considerable attention. The contribution of “nontraditional” emissions to the ambient TSP levels from the operation of motor vehicles in a downtown urban area, the City of Pittsburgh, has been assessed by a statistical analysis of carbon monoxide, coefficient of haze, and TSP levels at the monitor site. The results are interpreted in consideration of the design of control strategies.

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