达州市重点区县大气污染特征及冬季典型污染过程分析

——以2021年开江县为例

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关键词：环境空气质量；细颗粒物；后向轨迹；潜在源区；区域对比；开江县 中图分类号：X823 文献标识码：A 文章编号：1008-9500（2025）06-0203-07 DOI：10.3969/j.issn.1008-9500.2025.06.061

Analysis of Air Pollution Characteristics and Typical Winter Pollution Processes in Key Districts and Counties of Dazhou City -TakingKaijiangCountyin2o21asanExample

DENGXiaohan，ZHANGYu，JIANGHuixian，DUXinxin （Dazhou Ecological Environment Monitoring Center Station of Sichuan Province，Dazhou635ooo，China）

Abstract：Basedonthemonitoringdataofairpolltants inKaijiangcounty in2O21，thespatiotemporaldistribution characteristics of fine particulate matter （PM2.5. ），inhalable particulatematter （PM10） ，sulfur dioxide （SO2），nitrogen dioxide （NO 2/ ，carbon monoxide （CO），and ozone（ 03 ）and their relationship with meteorological factors are analyzed.The results show that the concentrations of PM2.5 ， PM10 ，CO，and O3 inKaijiang county in 2021 decreased compared to 2019，with SO concentration showing the largest decrease （42.9 % ），butN concentration significantly increased by 26.7% ，which 2

maybe related to increased traffc flowor changes in industrial emissions.During winter，particulate matterpollution intensifies，with PM2.5 concentration reaching 260μg/m3 in December，local pollution emissions are more prominent than in other districts and counties.The backward trajectory and potential source area analysis indicate that PM2.5 pollution is notonlyaffectedbylocalemissons，butalsobycrossregionaltransmissionfromsurroundingareassuchasKaizhoudistrict andYunyang countyin Chongqing city.Research haspointedout that theair polution problemin Kaijiang county is complex，anditisesaytoglocaliustralsssdspoaiourecool，dollteit surrounding areas to effectively improve air quality.

Keywords：ambientairquality;fineparticulate mater;backward trajectory;potentialsourcearea;regional comparison; Kaijiang county

随着经济的快速增长和城市化进程的加速，大气污染问题日益严重[1。（剩余6384字）