. 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 n C o c cu o c o O D) c o CO •4—' c Q) o c o O 50 40 30 20 10 0 50 40 30 20 10 —I—I—I—I—I—I—I—;—I—I—I—r Whole state o o o o Analysis of individual q filters for metals O q O n began in 1985. Q Q f. q J_ 9 N:0 0 0 0 0 0 0 50 40 41 36 18 19 I I r I I r I I I I I 1 i_ —I 1 1 1 1 1 T Chicago area -1—I—I—I—r N:0 0 0 0 0 0 0 36 26 29 IB 8 9 I I I I I I I I I I I I 1 —I—I—I—I
. 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 n C o c cu o c o O D) c o CO •4—' c Q) o c o O 50 40 30 20 10 0 50 40 30 20 10 —I—I—I—I—I—I—I—;—I—I—I—r Whole state o o o o Analysis of individual q filters for metals O q O n began in 1985. Q Q f. q J_ 9 N:0 0 0 0 0 0 0 50 40 41 36 18 19 I I r I I r I I I I I 1 i_ —I 1 1 1 1 1 T Chicago area -1—I—I—I—r N:0 0 0 0 0 0 0 36 26 29 IB 8 9 I I I I I I I I I I I I 1 —I—I—I—I—I—I—I—I—r Metro-East area "1—I—I—r m i^^^i_j N: 00000 006SSS46 r I I t 1 I 1 I t I I I I —I 1 1 1 1 1 1 1 1 T Remainder of state ^&##ie. N:0000000 65544 5 .1 I I , I 1 I 1 f I I 1 I I 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 Fe. N = number of samples. Figure 25. Trends in 24-hr maximum Fe concentrations in Illinois. -\—I—I—I—I—I—I—I—I—I—I—I—n Whole state. o o N:124104 93 86 30 46 47 48 36 39 27 16 17 r I I I I I I I I I I I I "T I I I I I I I I I I I I Chicago area N:BO 58 48 45 20 35 36 36 26 29 18 8 9 __l I I I I I I I I I I I 1_ 20 16 12 8 4 0 "1—I—I—I—I—I—I—I—I—I—I—I—I— Metro-East area o 9 N:15 16 17 15 4 55655544 t I I I 1 I I 1 I 1 1 I 1 ~I I I1IIIIIII1I Remainder of state %%%^A%^. N:29 30 28 26 66665S44S 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 Fe. N = number of samples. Figure 26. Trends in annual mean Fe concentrations in Illinois. 114. 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 res
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