. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. URBAN DYNAMICS Second are commercial and consumer solvents, another evaporative emission source. The categories within this group are personal products (, hair spray), household products (cleaners), auto products (engine cleaners) adhesive products (glues), pesti- cides (bug sprays) and miscellaneous products. Third highest in emissions are graphic arts, which includes the printing of newspapers
. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. URBAN DYNAMICS Second are commercial and consumer solvents, another evaporative emission source. The categories within this group are personal products (, hair spray), household products (cleaners), auto products (engine cleaners) adhesive products (glues), pesti- cides (bug sprays) and miscellaneous products. Third highest in emissions are graphic arts, which includes the printing of newspapers, books, magazines, fabric wall coverings and other materials. Solvent degreasing, which removes grease, fats, oil, wax or soil from the surface of metal, glass or plastic articles, emits the fourth highest amount of VOC's. Vehicle refueling emits just slightly more than auto refmishing (repainting) operations. And although emissions from service station storage tank refueling peaked in 1980 (as did emissions from many of the sources), they fell significantly by 1990 because of regulations governing the capture of vapors during storage tank (Stage I) refueling. Other sources of VOC's are combined into the category "other" and include traffic maintenance painting, dry cleaning, lawn and garden equipment, heavy construction equipment, underground tanks, asphalt paving, bakeries, structural fires, and com- mercial, residential and institutional fuel 1970 -?—Cook County 1980 - Collar counties* - Metro-East Figure 31. VOC emissions (tons per summer day), 1970 -1990. * Collar counties do not include Kendall and Grundy counties. Nitrogen Oxides and Carbon Monoxide Nitrogen oxides (NOx) and carbon monoxide (CO) are emitted during fuel combustion, which, in the urban category, includes residential, commercial and institutional fuel combustion, structural fires, lawn and garden equipment and heavy construction machinery. Figure 32 shows the 20-year trend of CO em
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