. The Changing Illinois environment : critical trends : summary report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. Atmosphere • 13 down in the atmosphere have the potential to react with and destroy ozone in the upper atmosphere that protects Hving thmgs from the sun's ultraviolet rays. (Ozone-destroying chemicals also are emitted from such natural sources as volcanoes.) CFCs are used in foam packaging, insulation, various kinds of containers and cartons, and refrigeration equipment; halons (chemicals used in fire
. The Changing Illinois environment : critical trends : summary report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. Atmosphere • 13 down in the atmosphere have the potential to react with and destroy ozone in the upper atmosphere that protects Hving thmgs from the sun's ultraviolet rays. (Ozone-destroying chemicals also are emitted from such natural sources as volcanoes.) CFCs are used in foam packaging, insulation, various kinds of containers and cartons, and refrigeration equipment; halons (chemicals used in fire-fighting equipment) are present in much small- er amounts than CFCs but have a much higher ozone-depleting potential per molecule. An estimated 2,105 tons of CFCs and halons are emitted in Illinois each year. The manufacture of CFCs will soon cease in the but many CFCs and halons remain in the environment. They are "stored" in appliances and materials that constitute a sizeable CFC and halon "; It is estimated that more than 35,000 tons are banked. This inventory is expected to remain unchanged for some years, as the equipment and materials they are part of (such as insulation) tend to be replaced slowly. Acid rain. Illinois precipitation is a dilute solution of sulfuric and nitric acids. However, these acids are partially neutralized by ammonium and calcmm particles from soil and from rock-surfaced roads. In the 1980s, acid-buffering airborne calcium decreased, but decreases in sulfate compounds occurring at the same time were even larg- er. The result, tests suggest, was a decrease in the acidity of precipitation. Weather Weather records tend to confirm popular opinion that, over time, the only thing that is predictable about Illinois weather is its variability. Records of temperature and precipita- tion that in some cases date to the mid-19th century suggest that long-term average tem- peratures in Illinois increased by four to five degrees F
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