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首页> 美国政府科技报告 >Examination of utility emissions contributions to elevated ozone concentrations in the Chicago area.
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Examination of utility emissions contributions to elevated ozone concentrations in the Chicago area.

机译：检查公用事业排放对芝加哥地区臭氧浓度升高的影响。

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In order to reduce the pollutant load to the atmosphere and subsequent damaging effects, Titles I and IV of the Clean Air Act Amendments of 1990 (CAAAs) require reductions in emissions of sulfur dioxide (SO(sub 2)), nitrogen oxides (NO(sub x)), and volatile organic compounds (VOCs). Title IV is aimed at reducing acidic deposition and requires utilities to reduce SO(sub 2) and NO(sub x) emissions to specified levels. As a consequence of this, many utilities will have to install SO(sub 2) and NO(sub x) control technologies. Title I is concerned with bringing regions into compliance with the National Ambient Air Quality Standards (NAAQS) for the criteria pollutants, among which is ozone (O(sub 3)). The NAAQS for O(sub 3) is 120 ppb (parts per billion by volume) hourly average concentration, not to be exceeded four times in three years. O(sub 3) is a secondary pollutant formed in the atmosphere when NO(sub x) and VOCs react together in the presence of sunlight. Utilities are a significant source of NO(sub x) and an unimportant source of VOCs. In the past, O(sub 3) control strategy has focused on reducing VOC emissions because of the possibility that reducing NO(sub x) actually might make O(sub 3) concentrations higher. However, this approach has not worked, perhaps because of underestimation of natural and manmade VOC emissions and transport of O(sub 3) from other regions. Computer modeling has shown that for many highly polluted areas massive NO(sub x) reductions may be necessary in addition to or in place of VOC controls. Utilities are a potential source of these NO(sub x) reductions.

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