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To improve ozone air quality, the benefit of reduction in volatile organic compounds (VOCs) according to ozone formation potential was better than to traditional mass control. Using the Taiwan Emission Data System (TEDS) in association with the Speciate database developed by the U.S. EPA, the ozone formation potential in Southern Taiwan was determined by the Maximum Incremental Reactivity (MIR) Scale of volatile organic compounds (VOCs). The results show that the major source of VOC emissions and ozone formation was biogenic emissions. With regards to ozone formation by pollution type, the VOC with the maximum ozone formation potential was ethylene in point source pollution, carbon monoxide in line source pollution, toluene in area source pollution, and ethylene in biogenic source pollution. Excepting the biogenic source, ethylene, toluene, and carbon monoxide accounted for 40.10﹪of total estimated ozone formation. The photochemical trajectory model was used to evaluate whether the MIR scale was applicable to Southern Taiwan. Reduction in ozone concentrations by completely eliminating ethylene, toluene, and carbon monoxide was not significant (<2.00﹪). Decreasing NOx emissions by 20﹪on the other hand, increased ozone reduction to over 60﹪. The MIR scale is more suitable for conditions where ozone formation is the most sensitive to VOC. According to the EKMA elimination model, ozone formation in Southern Taiwan is l
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