United States Department of Transportation
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The Portland Transit Mall Impact Study – Air Quality Impacts Report
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1981-12-01
[PDF-3.00 MB]
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Abstract:The purpose of the Air Quality Impacts report is to determine what effects the Portland Transit Mall has had on air quality in the downtown Portland area. One of the original objectives of the Transit Mall was its contribution toward the reduction of air pollution in downtown. Sufficient monitoring data are not currently available to determine the exact impacts of the Mall on downtown air quality, but it is assumed to have played a measurable role since it began operating in 1978. To meet the objective of the report, an emission density analysis of 1980 with-Mall conditions versus 1980 without-Mail conditions was conducted to determine whether, in fact, the Mall has contributed toward the reduction of the following four motor vehicle related pollutants: hydrocarbons, carbon monoxide, nitrogen oxides and suspended particulate. The findings of the analysis are usually discussed in terms of emission densities under without-Mail conditions. This report is composed of five sections. Section I briefly describes the background relationships between the Transit Mall and downtown and air quality planning efforts in the early 1970's. Section II describes trends in air quality in the Portland region, focusing on the downtown area, from 1970 to 1980. The purpose of this section is to establish an overall context of air quality in the Portland region and the downtown area for a better understanding of the findings presented in Section IV. Section II provides the reader with a basic understanding of the air pollution problem in Portland, as well as the sources and behaviors of the individual seven major pollutants over time. Section III describes in detail the methodology used for the emission density analysis, and Section IV presents the findings of the analysis. Major findings are summarized in Section V. Discussion of the findings is usually in terms of without-Mail conditions.
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