. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. TRANSPORTATION In most parts of the state, VOC emissions declined 25-30% during each of the past two decades, or 40- 50% over 18 years (Figure 11). In the collar coun- ties, emissions declined 20% during each period and 33% over the entire period. / / / ^ ^^H 1 ^^ ^^H ^ m^m 1 T^ 1 1 1 ./ â ' v , , , / Total State Non- Other Collar Counties â¡ 1982-91 â 1973-82 Figure 11. Percent change in VOC emissi

. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. TRANSPORTATION In most parts of the state, VOC emissions declined 25-30% during each of the past two decades, or 40- 50% over 18 years (Figure 11). In the collar coun- ties, emissions declined 20% during each period and 33% over the entire period. / / / ^ ^^H 1 ^^ ^^H ^ m^m 1 T^ 1 1 1 ./ â ' v , , , / Total State Non- Other Collar Counties â¡ 1982-91 â 1973-82 Figure 11. Percent change in VOC emissi Stock Photo
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. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. TRANSPORTATION In most parts of the state, VOC emissions declined 25-30% during each of the past two decades, or 40- 50% over 18 years (Figure 11). In the collar coun- ties, emissions declined 20% during each period and 33% over the entire period. / / / ^ ^^H 1 ^^ ^^H ^ m^m 1 T^ 1 1 1 ./ â ' v , , , / Total State Non- Other Collar Counties â¡ 1982-91 â 1973-82 Figure 11. Percent change in VOC emission^. Carbon Monoxide Similar to VOCs, carbon monoxide (CO) emissions have declined steadily since 1973 due to strict federal standards. CO emissions are now only 55% of 1973 levels (Figure 12). At the same time, emissions from diesel-fueled vehicles grew 60% and now account for 2.5% of highway CO, up from less than 1% in 1973.. 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 work.. Illinois. Dept. of Energy and Natural Resources; Critical Trends Assessment Project. Springfield, Ill. : Ill. Dept. of Energy and Natural Resources

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