. 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 CO D5 c g i_ -*â' c Q) O c o O -| 1 1 1 r O "TâIâIâIâIâr Whole state N:93 101 97 46 46 45 51 39 31 19 15 17 I I I I I I I I I I I 1_ â;âIâIâIâIâIâIâIâ1âr- o Metro-East area N:16 15 16 I I L_ 7 7 _l l_ 6 5 4 4 J I I 1_ T 1 1 1 1 1 1 1 1 1 1 1â Chicago area â ^##.ft ^iS. N:52 60 60 35 34 33 37 27 21 11
. 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 CO D5 c g i_ -*â' c Q) O c o O -| 1 1 1 r O "TâIâIâIâIâr Whole state N:93 101 97 46 46 45 51 39 31 19 15 17 I I I I I I I I I I I 1_ â;âIâIâIâIâIâIâIâ1âr- o Metro-East area N:16 15 16 I I L_ 7 7 _l l_ 6 5 4 4 J I I 1_ T 1 1 1 1 1 1 1 1 1 1 1â Chicago area â ^##.ft ^iS. N:52 60 60 35 34 33 37 27 21 11 7 8 I I 1 I 1 I I I I I I 1_ ~i I I I I I I 1 1 I I r Remainder of state N:25 26 21 6 5 5 6 5 4 3 J I I I I I l_ 79 80 81 82 83 84 85 86 87 88 89 90 79 80 81 82 83 84 85 86 87 88 89 90 Year Note: Standards are based on the quarterly arithmetic mean. See text. N = number of samples. Figure 3. Trends in annual mean Pb concentrations in Illinois. E Q. Q. C o ^â⢠c Q) O c o O TârâIâIâr -1âIâIâIâr Whole state o o. ~I I I I p It â TâIâIâIâIâIâr- Chicago area o o. 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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