西藏自治区大气环境质量现状及其未来展望  

Present Situation and Prospect of Atmospheric Environmental Quality in Tibet Autonomous Region

作　　者：格桑德吉 李佩航 贾慧 阿琼 Gesang Deji;LI Peihang;JIA Hui;A Qiong(Tibet Ecological Environment Monitoring Center,Lhasa Tibet 850000,China;不详)

机构地区：[1]西藏自治区生态环境监测中心,西藏拉萨850000 [2]江苏大学环境与安全工程学院,江苏镇江212013

出　　处：《环境科学导刊》2023年第1期54-61,共8页Environmental Science Survey

摘　　要：通过采集2015—2021年西藏自治区共7个城市和地区的SO_(2)、NO_(2)、CO、O_(3)、PM_(10)、PM_(2.5)等浓度实时监测数据,对污染物的污染特征与现状进行了分析。结果表明:PM_(2.5)、PM_(10)、SO_(2)、NO_(2)、CO年均浓度的变化情况较为稳定,O_(3)和NO_(X)浓度呈上升趋势,O_(3)-8h平均浓度由2015年的105μg/m~3上升到2021年的124μg/m~3,O_(3)超标污染天数主要出现在5—8月份;PM_(2.5)月均浓度变化呈现显著的季节差异,每年夏季(7—9月)PM_(2.5)的含量较低,11月—次年3月含量较高;大气综合污染指数都<5,优良天数比率98.5%~99.7%。统计年份中,各年度O_(3)和2015年、2016年PM_(2.5)年均浓度达到Ⅱ级标准,其余4项评价指标年均浓度均达到I级标准,全区环境空气质量持续保持良好。拉萨市和昌都市的NO_(2)/SO_(2)的比值较大,而那曲市和阿里地区的NO_(2)/SO_(2)的比值较小。This paper analyzed the pollution characteristics and current situation of pollutants by collecting realtime monitoring data of SO_(2),NO_(2),CO,O_(3),PM_(10),PM_(2.5) in seven cities of Tibet Autonomous Region from 2015 to2021.The results showed that the annual average concentrations of PM_(2.5),PM_(10),SO_(2),NO_(2) and CO were relatively stable,and the concentrations of O_(3) and NO_(X) showed an upward trend.The average concentration of O_(3)-8h increased from 105μg/m~3 in 2015 to 124μg/m~3 in 2021.O_(3) concentration over the standard mainly occurred from May to August.The monthly average concentration of PM_(2.5) showed significant seasonal difference.The content of PM_(2.5) was low in summer (July-September) and high from November to March of the next year.The comprehensive air pollution index was less than 5,and the ratio of excellent days was 98.5%~99.7%.In the statistical years,the annual average concentration of O_(3) and PM_(2.5) in 2015 and 2016 reached the standard II,and the annual average concentration of the other four evaluation indicators reached the standard I,and the ambient air quality in the whole region remained good.The ratio of NO_(2)/SO_(2) in Lhasa City and Changdu City was larger than the ratio in Naqu City and Ali City.The research results would provide reference for air pollution control in Tibet Autonomous Region.

关 键 词：大气环境 污染特征 现状分析 评价 西藏自治区 

分 类 号：X51[环境科学与工程—环境工程]