Regional Transport of PM _2.5 and O ₃ Based on Complex Network Method and Chemical Transport Model in the Yangtze River Delta, China

Ground-level ozone (O3) and atmospheric fine particulate matter (PM2.5) pollution are the major challenges for continually improving air quality in Yangtze River Delta (YRD) region of China. Understanding regional transport patterns PM2.5 O3 is essential development cooperative prevention strategies. This study shows annual concentration YRD decreased by 18.5% from 2015 to 2018, while mean values daily maximum 8-hr average (MDA8) March October increased 16.3%. A complex network method utilized investigate different grid cells (nodes). The source apportionment within chemistry model applied verify reliability method. Interregional intraregional play an important role both over YRD. northern part contributes much more than other areas, central YRD, especially southern Jiangsu, largest contributor summer, accounting about 70%. Intraregional plays a increasing pollution. not only verifies heavy through traditional technology, it also reveals that methods provide great potential understanding relationships, which solid foundation emission mitigation region.