. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. HUMAN EXPOSURE TO AIR POLLUTION HUMAN EXPOSURE TO AIR POLLUTION This chapter presents trends in human exposure to environmental pollutants in ambient air. It does not attempt to provide a statewide risk assessment or to predict or interpret the health impact of the exposure. The requisite data was not available to develop such an assessment. A simple procedure was developed to assess exposure. Ambie
. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. HUMAN EXPOSURE TO AIR POLLUTION HUMAN EXPOSURE TO AIR POLLUTION This chapter presents trends in human exposure to environmental pollutants in ambient air. It does not attempt to provide a statewide risk assessment or to predict or interpret the health impact of the exposure. The requisite data was not available to develop such an assessment. A simple procedure was developed to assess exposure. Ambient measurements for criteria air pollutants were compared to their legal standards' (Table 1); those above the standard were assumed to present some risk and those below the standard were assumed to present no (Figure 1) The duration and magnitude of the exposure, and the interaction of multiple pollutants, was not factored into the analysis. Data for the analysis was taken firom the Illinois Environmental Protection Agency's (lEPA) annual reports on air quality, 1978 through 1990, and provided by the State Water Survey in a Geographic Information System (GIS) format, which allows for both mapping and attribute analysis. The criteria air pollutants that were examined include sulfur dioxide (SO2), ozone (O3), lead (Pb), carbon monoxide (CO), nitric oxides (NOx) and total suspended. particulate (TSP). (See Volume 1: Air Resources for discussion of the data and ambient trends.) To develop population exposure estimates, a GIS was used to place a one-mile buffer around air quality sta- tions which had at least one measurement recorded above the legal standard. A five-mile buffer was also considered, but measurements from stations within five miles of each other were rarely similar ~ one measurement would be above and the others below the standard. This indicated that a five-mile buffer might overcount the number of people exposed to the pollutant Figure 2 illustrates the one-
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