. 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 35 E D. Q. c" o c O c o O Note: The national and state primary standards for 1-hr average CO are both 35 ppm. These are not to be exceeded more than once per year. N = number of samples. 30 - 25 20 15 10 5 0 —1—I—I—I—I—I—I—I—I—r Remainder of state. Year 78 79 80 81 82 83 84 85 86 87 88 89 90 Figure 1. Trends in 1-hr maximum CO concentrations in
. 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 35 E D. Q. c" o c O c o O Note: The national and state primary standards for 1-hr average CO are both 35 ppm. These are not to be exceeded more than once per year. N = number of samples. 30 - 25 20 15 10 5 0 —1—I—I—I—I—I—I—I—I—r Remainder of state. Year 78 79 80 81 82 83 84 85 86 87 88 89 90 Figure 1. Trends in 1-hr maximum CO concentrations in 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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