. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. DU PAGE COOK I • WILL 1990 Figure 37. Spatial distributions of 1-hr maximum O^ (ppm) in the Chicago area for 1980. 1985. and 1990. Shaded areas denote violations of an air quality standard. 131. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations ma
. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. DU PAGE COOK I • WILL 1990 Figure 37. Spatial distributions of 1-hr maximum O^ (ppm) in the Chicago area for 1980. 1985. and 1990. Shaded areas denote violations of an air quality standard. 131. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Dept. of Energy and Natural Resources; Critical Trends Assessment Project. Springfield, Ill. : Ill. Dept. of Energy and Natural Resources
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