<?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%">SY Chen</style></author><author><style face="normal" font="default" size="100%">Wang, H. C.</style></author><author><style face="normal" font="default" size="100%">Lu, K. D.</style></author><author><style face="normal" font="default" size="100%">L.M. Zeng</style></author><author><style face="normal" font="default" size="100%">Hu, M.</style></author><author><style face="normal" font="default" size="100%">Zhang, Y. H.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">The trend of surface ozone in Beijing from 2013 to 2019: Indications of the persisting strong atmospheric oxidation capacity</style></title><secondary-title><style face="normal" font="default" size="100%">Atmospheric Environment</style></secondary-title><alt-title><style face="normal" font="default" size="100%">Atmos Environ</style></alt-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">air-quality</style></keyword><keyword><style  face="normal" font="default" size="100%">beijing china</style></keyword><keyword><style  face="normal" font="default" size="100%">China</style></keyword><keyword><style  face="normal" font="default" size="100%">emissions</style></keyword><keyword><style  face="normal" font="default" size="100%">long-term trend</style></keyword><keyword><style  face="normal" font="default" size="100%">nitrogen-oxides</style></keyword><keyword><style  face="normal" font="default" size="100%">ozone pollution</style></keyword><keyword><style  face="normal" font="default" size="100%">photochemistry</style></keyword><keyword><style  face="normal" font="default" size="100%">pollution</style></keyword><keyword><style  face="normal" font="default" size="100%">precursors</style></keyword><keyword><style  face="normal" font="default" size="100%">rural site</style></keyword><keyword><style  face="normal" font="default" size="100%">the trend of o-3</style></keyword><keyword><style  face="normal" font="default" size="100%">urban</style></keyword><keyword><style  face="normal" font="default" size="100%">weekend</style></keyword><keyword><style  face="normal" font="default" size="100%">weekend effect</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2020</style></year><pub-dates><date><style  face="normal" font="default" size="100%">Dec 1</style></date></pub-dates></dates><volume><style face="normal" font="default" size="100%">242</style></volume><isbn><style face="normal" font="default" size="100%">1352-2310</style></isbn><language><style face="normal" font="default" size="100%">English</style></language><abstract><style face="normal" font="default" size="100%">We report a continuous record of surface ozone (O-3) in urban Beijing, China, from 2013 to 2019. A linear fit to the 7-year record shows that the annual MDA8-O-3 (the maximum daily average of 8-h O-3 concentration) and annual average O-3 increased by 2.30 and 1.91 ppbv yr(-1) (p &amp;lt; 0.05), respectively. Both the MDA8-O-3 level and the number of exceeding days are increased, demonstrating the surface O-3 pollution in Beijing is increasingly serious. An overall decrease in annual surface NO2 was observed at a rate of -1.21 ppbv yr(-1) (p &amp;lt; 0.01). The total oxidants (O-x, = NO2 + O-3) had an upward trend during 2013-2019 at a rate of 0.70 ppbv h(-1) (p = 0.168). The increasing O-3 and Or trends imply the atmospheric oxidation capacity is increasing in Beijing, even though the strict emission policies have been implemented. The periodical changes of surface O-3 in different time scales are studied. We found that the increases in O-3 are mainly at a high O-3 level with a threshold of 30 ppbv. The relative diurnal variability of surface O-3 is weakened, with a decrease in the diurnal amplitude variation. Both the extremely low and high 5% surface O-3 are increased, indicates an overall uplift of surface O-3. The weekday periodic trends showed an increment of weekend MDA8-O-3 (2.2 ppbv on average) and companies with a decrement of weekend NO2 (1.5 ppbv on average). The weekend effect provides a chance to look insights into reducing O-3 exceeding days during summertime and proposes the need for emission abatements of volatile organic compounds to the mitigation of ozone pollution in Beijing.</style></abstract><accession-num><style face="normal" font="default" size="100%">WOS:000576810300008</style></accession-num><notes><style face="normal" font="default" size="100%">&lt;p&gt;Nz0vcTimes Cited:0Cited References Count:43&lt;/p&gt;</style></notes><auth-address><style face="normal" font="default" size="100%">Peking Univ, Coll Environm Sci &amp;amp;amp; Engn, State Key Joint Lab Environm Simulat &amp;amp;amp; Pollut Con, Beijing 100871, Peoples R ChinaSun Yat Sen Univ, Sch Atmospher Sci, Guangzhou 510275, Peoples R ChinaGuangdong Prov Observat &amp;amp;amp; Res Stn Climate Environ, Guangzhou 510275, Peoples R ChinaSouthern Marine Sci &amp;amp;amp; Engn Guangdong Lab Zhuhai, Zhuhai 519082, Peoples R China</style></auth-address></record></records></xml>