Analysis of Ozone Secondary Pollution Integrated Management in Seoul Due to Emissions Reduction During Heat Wave Episodes

Korea has designated 'heat waves' as natural disasters since 2018. Ozone is a secondary air pollutant produced by photochemical reactions, so in order to control the ozone concentration, its precursors must be managed with heat wave-related policies and air environmental policies, which naturally include climate change policies. Ozone also acts as an oxidant that accelerates the production of PM2.5 while having precursors similar to PM2.5. Therefore, this study analyzed the effect of improving ozone concentration in Seoul due to reduction of emissions in the Seoul metropolitan area during heat wave periods for integrated ozone management. The scenario periods were selected from periods that satisfied the heat wave definition (33 degrees C or higher) for all the synoptic weather stations in the Seoul metropolitan area, and in contrast, a non-heat wave period that did not meet the heat wave definition was selected and analyzed. In order to consider appropriate emissions reductions in the Seoul metropolitan area, scenarios were designated by applying a 30% reduction in emissions, which is the goal of the Comprehensive Measures for Fine Dust Management ('17.09) to the Seoul metropolitan area. Modeling was performed using Weather Research and Forecasting Model (WRF), Sparse Matrix Operator Kernel Employment (SMOKE), and Community Multiscale Air Quality (CMAQ) for ozone concentration analysis. In addition, Process Analysis IPR (Integrated Process Rate) of CMAQ was utilized to analyze the contribution of ozone generation by physical and chemical processes during the heat waves.