<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Min Shao</style></author><author><style face="normal" font="default" size="100%">Wenjie Wang</style></author><author><style face="normal" font="default" size="100%">Yuan, Bin</style></author><author><style face="normal" font="default" size="100%">Parrish, David D.</style></author><author><style face="normal" font="default" size="100%">Xin Li</style></author><author><style face="normal" font="default" size="100%">Lu, Keding</style></author><author><style face="normal" font="default" size="100%">Luolin Wu</style></author><author><style face="normal" font="default" size="100%">Xuemei Wang</style></author><author><style face="normal" font="default" size="100%">Ziwei Mo</style></author><author><style face="normal" font="default" size="100%">Suxia Yang</style></author><author><style face="normal" font="default" size="100%">Yuwen Peng</style></author><author><style face="normal" font="default" size="100%">Ye Kuang</style></author><author><style face="normal" font="default" size="100%">Chen, Weihua</style></author><author><style face="normal" font="default" size="100%">Min Hu</style></author><author><style face="normal" font="default" size="100%">Limin Zeng</style></author><author><style face="normal" font="default" size="100%">Su, Hang</style></author><author><style face="normal" font="default" size="100%">Yafang Cheng</style></author><author><style face="normal" font="default" size="100%">Junyu Zheng</style></author><author><style face="normal" font="default" size="100%">Yuanhang Zhang</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Quantifying the role of PM2.5 dropping in variations of ground-level ozone: Inter-comparison between Beijing and Los Angeles</style></title><secondary-title><style face="normal" font="default" size="100%">Science of The Total Environment</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">ozone</style></keyword><keyword><style  face="normal" font="default" size="100%">PM</style></keyword><keyword><style  face="normal" font="default" size="100%">Pollution control</style></keyword><keyword><style  face="normal" font="default" size="100%">Volatile organic compounds</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2021</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">https://www.sciencedirect.com/science/article/pii/S0048969721027832</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">788</style></volume><pages><style face="normal" font="default" size="100%">147712</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">In recent decade the ambient fine particle (PM2.5) levels have shown a trend of distinct dropping in China, while ground-level ozone concentrations have been increasing in Beijing and many other Chinese mega-cities. The variation pattern in Los Angeles was markedly different, with PM2.5 and ozone decreasing together over past decades. In this study, we utilize observation-based methods to establish the parametric relationship between PM2.5 concentration and key aerosol physical properties (including aerosol optical depth and aerosol surface concentration), and an observation-based 1-D photochemical model to quantify the response of PM2.5 decline in enhancing ground-level ozone pollution over a large PM2.5 concentration range (10–120 μg m−3). We find that the significance of ozone enhancement due to PM2.5 dropping depends on both the PM2.5 levels and optical properties of particles. Ozone formation increased by 37% in 2006–2016 due to PM2.5 dropping in Beijing, while it becomes less important (7%) as PM2.5 reaches below 40 μg/m3, similar to Los Angeles since 1980s. Therefore, the two cities show the convergence of air pollutant characteristics. Hence a control strategy prioritizing reactive volatile organic compound abatement is projected to yield simultaneous ozone and PM2.5 reductions in Beijing, as experienced in Los Angeles.</style></abstract></record></records></xml>