. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. o '-' o 0 6 0 0 N:36 33 21 21 18 21 21 13 10 9 8 14 II I I I I I L. -|—I—I—I—I—I—I—I—I—I—I—I—r- Chlcago area o. o O 6 O o N:36 32 21 21 18 19 19 12 9 8 7 13 J I I I I I I I I I I I U 78 79 80 81 82 83 84 85 86 87 88 89 90 78 79 80 81 82 83 84 85 86 87 88 89 90 Year Note; The national and state standards for annual mean NOg are ppm. N= number of samples. Figure 6. Trends in annual mean NO conce
. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. o '-' o 0 6 0 0 N:36 33 21 21 18 21 21 13 10 9 8 14 II I I I I I L. -|—I—I—I—I—I—I—I—I—I—I—I—r- Chlcago area o. o O 6 O o N:36 32 21 21 18 19 19 12 9 8 7 13 J I I I I I I I I I I I U 78 79 80 81 82 83 84 85 86 87 88 89 90 78 79 80 81 82 83 84 85 86 87 88 89 90 Year Note; The national and state standards for annual mean NOg are ppm. N= number of samples. Figure 6. Trends in annual mean NO concentrations in Illinois. 104. 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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