This study used the WRF-CMAQ model to simulate and conduct source apportionment for a case of compound pollution in Jinzhong City.By designing 49 different scenarios of VOCs and NOx emission reductions and combining them with EKMA curves to evaluate the scientific reduction ratios of their precursors.The results revealed that industrial and traffic sources are the main contributors to VOCs and NOx in Jincheng City.O3 pollution is mainly influenced by NOx levels,whereas PM2.5 pollution is primarily controlled by VOCs.Considering non-extreme reduction scenarios,for O3 pollution control alone,the optimal VOCs/NOx reduction ratio is 1∶2;for PM2.5 pollution control alone,the optimal reduction ratio is 2∶1.When considering the coordinated control of both PM2 5 and O3 pollution,the best precursor reduction ratio of VOCs to NOx is 2∶1.
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