. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. AIR QUALITY TRENDS IN ILLINOIS. c CD O c o O T—r—I—I—I—I—I—I—I—I—I—I—I" „ Chicago area / Standard N:44 47 25 13 14 15 14 14 14 11 11 11 11 I I I L. 78 79 80 81 82 83 84 85 86 87 88 89 90o 30 Note: The national and state primary standards for 24-hr maximum SOg concentration are both ppm. N = number of samples. I I I I I r. Please note that these images are extr
. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. AIR QUALITY TRENDS IN ILLINOIS. c CD O c o O T—r—I—I—I—I—I—I—I—I—I—I—I" „ Chicago area / Standard N:44 47 25 13 14 15 14 14 14 11 11 11 11 I I I L. 78 79 80 81 82 83 84 85 86 87 88 89 90o 30 Note: The national and state primary standards for 24-hr maximum SOg concentration are both ppm. N = number of samples. I I I I I r. 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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