典型文献
PM2.5 and water-soluble inorganic ion concentrations decreased faster in urban than rural areas in China
文献摘要：
We investigated variations of PM2.5 and water-soluble inorganic ions chemical characteris-tics at nine urban and rural sites in China using ground-based observations.From 2015 to 2019,mean PM2.5 concentration across all sites decreased by 41.9 μg/m3 with a decline of 46％at urban sites and 28％at rural sites,where secondary inorganic aerosol(SIAs)contributed to 21％(urban sites)and 17％(rural sites)of the decreased PM2.5.SIAs concentrations un-derwent a decline at urban locations,while sulfate(SO42-),nitrate(NO3-),and ammonium(NH4+)decreased by 49.5％,31.3％and 31.6％,respectively.However,only SO42-decreased at rural sites,NO3-increased by 21％and NH4+decreased slightly.Those changes contributed to an overall SIAs increase in 2019.Higher molar ratios of NO3-to SO42-and NH4+to SO42-were observed at urban sites than rural sites,being highest in the heavily polluted days.Mean molar ratios of NH3/NHx were higher in 2019 than 2015 at both urban and rural sites,implying increasing NHx remained as free NH3.Our observations indicated a slower transi-tion from sulfate-driven to nitrate-driven aerosol pollution and less efficient control of NOx than SO2 related aerosol formation in rural regions than urban regions.Moreover,the com-mon factor at urban and rural sites appears to be a combination of lower SO42-levels and an increasing fraction of NO3-to PM2.5 under NH4+-rich conditions.Our findings imply that synchronous reduction in NOx and NH3 emissions especially rural areas would be effective to mitigate NO3-driven aerosol pollution.
文献关键词：
中图分类号：
作者姓名：
Yangyang Zhang;Aohan Tang;Chen Wang;Xin Ma;Yunzhe Li;Wen Xu;Xiaoping Xia;Aihua Zheng;Wenqing Li;Zengguo Fang;Xiufen Zhao;Xianlong Peng;Yuping Zhang;Jian Han;Lijuan Zhang;Jeffrey L.Collett Jr.;Xuejun Liu
作者机构：
Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation,College of Resources and Environmental Sciences,National Academy of Agriculture Green Development,China Agricultural University,Beijing 100193,China;Analysis and Testing Center,Beijing Normal University,Beijing 100875,China;Fujian Institute of Tobacco Agricultural Sciences,Fuzhou 350003,China;College of Resources and Environment,Qingdao Agricultural University,Qingdao 266109,China;College of Resources and Environment,Northeast Agricultural University,Haerbin 150030,China;College of Resources and Environment,Hunan Provincial Key Laboratory of Farmland Pollution Control and Agricultural Resources Use,Hunan Agricultural University,Changsha 410128,China;College of Resources and Environment,Hebei Agricultural University,Baoding 071001,China;Department of Atmospheric Science,Colorado State University,Fort Collins,CO 80523,USA
文献出处：
引用格式：
[1]Yangyang Zhang;Aohan Tang;Chen Wang;Xin Ma;Yunzhe Li;Wen Xu;Xiaoping Xia;Aihua Zheng;Wenqing Li;Zengguo Fang;Xiufen Zhao;Xianlong Peng;Yuping Zhang;Jian Han;Lijuan Zhang;Jeffrey L.Collett Jr.;Xuejun Liu-.PM2.5 and water-soluble inorganic ion concentrations decreased faster in urban than rural areas in China)[J].环境科学学报（英文版）,2022(12):83-91
A类：
SIAs,NH4+decreased,NH4+to
B类：
PM2,water,soluble,inorganic,concentrations,faster,urban,than,rural,areas,China,We,investigated,variations,chemical,characteris,tics,nine,sites,using,ground,observations,From,mean,across,by,decline,where,secondary,aerosol,contributed,derwent,locations,while,sulfate,SO42,nitrate,NO3,ammonium,respectively,However,only,increased,slightly,Those,changes,overall,Higher,molar,ratios,were,observed,being,highest,heavily,polluted,days,Mean,NH3,NHx,higher,both,implying,increasing,remained,free,Our,indicated,slower,transi,from,driven,pollution,less,efficient,control,NOx,SO2,related,formation,regions,Moreover,appears,combination,levels,fraction,under,rich,conditions,findings,that,synchronous,reduction,emissions,especially,would,effective,mitigate
AB值：
0.424472
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机标中图分类号，由域田数据科技根据网络公开资料自动分析生成，仅供学习研究参考。
