O3 source contribution during a heavy O3 pollution episode in Shanghai China

Abstract

Source culpability assessments are useful for developing effective emission control strategies. The Integrated Source Apportionment Method (ISAM) has been implemented in CMAQ to track contributions from source groups and regions to ambient levels and deposited amounts of O3. CMAQ-ISAM has been used to simulate a heavy O3 pollution episode in Shanghai during June 2–6, 2015, to quantify the contributions of the precursor emission from different regions to O3 concentration in Shanghai, to identify the relative importance of different ways by which regional sources affected the O3 levels in Shanghai, and to investigate the sensitivity of O3 formation to the precursors during the episode. The results from this study could be helpful to diagnose deficiency in the emission inputs of the air quality forecasting system which has been operating daily since 2010 World Expo.