. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. 78 79 80 81 82 83 84 85 86 87 88 89 90 25 Note: The Federal and State Primary Standards for 8-hr average CO are both 9 ppm. These are not to be exceeded more than once per year. N= number of Year 78 79 80 81 82 83 84 85 86 87 88 89 90 Figure 2. Trends in 8-hr maximum CO concentrations in Illinois. 102. Please note that these images are extracted from scanned page images that may have been
. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. 78 79 80 81 82 83 84 85 86 87 88 89 90 25 Note: The Federal and State Primary Standards for 8-hr average CO are both 9 ppm. These are not to be exceeded more than once per year. N= number of Year 78 79 80 81 82 83 84 85 86 87 88 89 90 Figure 2. Trends in 8-hr maximum CO concentrations in Illinois. 102. 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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