芜湖市臭氧污染现状及其影响因素分析  

Analysis of ozone pollution and its influencing factors in Wuhu City

作　　者：王文婧[1] 吴婷[1] 严云志[1,2] 查书平 丁同刚 WANG Wenjing;WU Ting;YAN Yunzhi;ZHA Shuping;DING Tonggang(School of Ecology and Environment, Anhui Normal University, Wuhu 241003, China;Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-founded by Anhui Province and Ministry of Education, Wuhu 241003, China;School of Humanities and Tourism, Wuhu Institute of Technology, Wuhu 241006, China;Beijing Shida Qingtian Environmental Protection Technology Co. Ltd., Beijing 100071, China)

机构地区：[1]安徽师范大学生态与环境学院,芜湖241003 [2]皖江流域退化生态系统的恢复与重建省部共建协同创新中心,芜湖241003 [3]芜湖职业技术学院人文旅游学院,芜湖241006 [4]北京师达擎天环保科技有限公司,北京100071

出　　处：《青岛理工大学学报》2022年第1期85-92,共8页Journal of Qingdao University of Technology

基　　金：国家自然科学基金资助项目(41475109,41601189,41701634);安徽省高校自然科学重点研究项目(KJ2019A0984);大气重污染成因与治理攻关项目(DQGG-05-32);科技创新团队项目(wzykjtd202001);科技创新服务平台培育项目(Kjcxpt202007);芜湖市科技成果转化项目(2020ms1-5,2020ms1-4)。

摘　　要：为了研究芜湖市臭氧污染现状及其与影响因素相关关系,利用芜湖市2018—2019年气象观测资料、3个国家环境监测站点的臭氧及其前体物NO_(2),NO和CO等监测资料进行统计分析。结果表明,芜湖市2018年臭氧超标47 d,占全年超标天数总量的48%,2019年臭氧超标56 d,占全年超标天数总量的54.9%,臭氧已成为影响芜湖市环境空气质量的首要污染物;日平均气温与臭氧为首要污染物的频率呈显著正相关关系,相关系数高达0.966,当日平均气温在25~30℃时,芜湖市臭氧易超标;干燥的气候条件有利于臭氧的积累,当60%<相对湿度(RH)<70%时,臭氧为首要污染物频率最高,达66.70%,而当相对湿度>70%时,随湿度增加,臭氧为首要污染物频率、O_(3)-8h-max(臭氧日最大8 h滑动平均浓度)及臭氧超标频率均呈现显著下降趋势,尤其是当相对湿度>90%时,臭氧浓度处于最低值;芜湖市臭氧超标率比较高的主导风向为WS,ESE和NE,超标率分别占到31.6%,24.7%和18.2%,当1 m/s<WS<3 m/s时,近地面大气混合作用强,扩散不利,臭氧容易积累超标;臭氧污染程度与其前体物(NO_(x)和VOCs)排放量成正相关关系,而在日变化规律中,臭氧浓度与其前体物浓度均成明显的负相关关系,相关系数达0.7。In order to study the current situation of ozone pollution in Wuhu and its correlation with influencing factors,the meteorological observation data in 2018—2019,the monitoring data of O_(3) and its precursors NO_(2),NO and CO at 3 national environmental monitoring stations were used for statistical analysis.The results show that the number of days with O_(3) exceeding the standard in 2018 is 47,accounting for 48%of the total number of days exceeding the standard in the whole year.The number of days with O_(3) exceeding standard in 2019 is 56,accounting for 54.9%of the total number of days exceeding the standard in the whole year.Ozone has become the primary pollutant affecting the air quality of Wuhu city.There is a significantly positive correlation between the daily average air temperature and the frequency of O_(3) as the primary pollutant,with the correlation coefficient as high as 0.966.When the daily average air temperature is greater than 25℃and less than 30℃,O_(3) tends to exceed the standard.Dry climate conditions are conducive to O_(3) accumulation.When RH is greater than 60%and less than 70%,O_(3) is the primary pollutant with the highest frequency,up to 66.70%.When RH is greater than 70%,the primary pollutant frequency of O_(3),O_(3)-8h-max(the maximum 8 h sliding average concentration of O_(3))and the frequency of O_(3) exceeding standard all show a significant decline trend with the increase of humidity.Especially when relative humidity is greater than 90%,ozone concentration is at the lowest value;In Wuhu,WS,ESE and NE are the dominant wind directions with high ozone exceeding the standard rate,accounting for 31.6%,24.7%and 18.2%respectively.When wind speed is greater than 1 m/s and less than 3 m/s,the near surface atmospheric mixing is strong,the diffusion is not good,and the ozone tends to accumulate and exceed the standard.The degree of ozone pollution is positively correlated with the emission of precursor(NO_(x) and VOCs),while in the diurnal variation law,the ozone concentration is sign

关 键 词：环境 臭氧污染 芜湖 影响因素 气象条件 

分 类 号：X515[环境科学与工程—环境工程]