. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. N:72 80 48 45 20 35 36 37 26 29 18 7 8 I I I I I I I I I I I I I â1 1 1 1 1 1 1â Remainder of state. ibB ^- â N:25 30 28 26 66665 544 5 I I I I I I I I I I I I 1- 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: There are no national or state standards for NO3'. N = number of samples. Figure 16. Trends in annual mean NO^ concentrations in Illinois. 109. Please
. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. N:72 80 48 45 20 35 36 37 26 29 18 7 8 I I I I I I I I I I I I I â1 1 1 1 1 1 1â Remainder of state. ibB ^- â N:25 30 28 26 66665 544 5 I I I I I I I I I I I I 1- 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: There are no national or state standards for NO3'. N = number of samples. Figure 16. Trends in annual mean NO^ concentrations in Illinois. 109. 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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