Emission source-based ozone isopleth and isosurface diagrams and their significance in ozone pollution control strategies |
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Authors: | Huihong Luo Kaihui Zhao Zibing Yuan Leifeng Yang Junyu Zheng Zhijiong Huang Xiaobo Huang |
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Affiliation: | 1. School of Environment and Energy, South China University of Technology, Guangzhou 510006, China;2. Institute of Environmental and Climate Research, Jinan University, Guangzhou 510632, China;3. Shenzhen Academy of Environmental Sciences, Shenzhen 518022, China |
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Abstract: | In the past decade, ozone (O3) pollution has been continuously worsening in most developing countries. The accurate identification of the nonlinear relationship between O3 and its precursors is a prerequisite for formulating effective O3 control measures. At present, precursor-based O3 isopleth diagrams are widely used to infer O3 control strategy at a particular location. However, there is frequently a large gap between the O3-precursor nonlinearity delineated by the O3 isopleths and the emission source control measures to reduce O3 levels. Consequently, we developed an emission source-based O3 isopleth diagram that directly illustrates the O3 level changes in response to synergistic control on two types of emission sources using a validated numerical modeling system and the latest regional emission inventory. Isopleths can be further upgraded to isosurfaces when co-control on three types of emission sources is investigated. Using Guangzhou and Foshan as examples, we demonstrate that similar precursor-based O3 isopleths can be associated with significantly different emission source co-control strategies. In Guangzhou, controlling solvent use emissions was the most effective approach to reduce peak O3 levels. In Foshan, co-control of on-road mobile, solvent use, and fixed combustion sources with a ratio of 3:1:2 or 3:1:3 was best to effectively reduce the peak O3 levels below 145 ppbv. This study underscores the importance of using emission source-based O3 isopleths and isosurface diagrams to guide a precursor emission control strategy that can effectively reduce the peak O3 levels in a particular area. |
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Keywords: | Corresponding author. Tropospheric ozone pollution Ozone-precursor nonlinearity Source-based ozone isosurface Pearl River Delta |
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