玉溪市主城区环境空气质量特征分析

Analysis on Characteristics of Ambient Air Quality in Urban Areas of Yuxi City

为研究玉溪市主城区环境空气质量特征,选取玉溪市2021年三个国控环境空气质量自动监测站数据,对玉溪市城区环境空气质量变化趋势、污染特征及影响因素进行分析。结果表明,2021年玉溪市城区环境空气质量总体较好,各项污染物年均浓度均达到二级要求,优良天数比例达99.2%,未出现中度及以上污染;主要污染物为O_(3),占74%,其次是PM_(10)和PM_(2.5)。1—4月及12月是环境空气质量相对较差的月份,冬春季污染明显高于夏秋季。在东南亚国家春季生物质燃烧、生产、生活和气象因素综合影响下,以臭氧为主、颗粒物为辅的复合型污染态势初显。

In order to study the characteristics of ambient air quality in the main urban area of Yuxi city,the data of three state-controlled automatic ambient air quality monitoring stations in 2021 were selected to analyze the variation trend,pollution characteristics and influencing factors of air quality.The results showed that in 2021,the ambient air quality in Yuxi city was generally good,the average annual concentration of all pollutants met the second-level requirements of GB 3095-2012,the proportion of good days reached 99.2%,and there was no moderate or above pollution events.The main pollutant was O_(3),accounting for 74%,followed by PM_(10) and PM_(2.5).From January to April and December,the ambient air quality was relatively poor,and the pollution in winter and spring was obviously higher than that in summer and autumn.Under the comprehensive influence of biomass combustion in south-east Asian countries in spring,combining with the production,living and meteorological factors,the composite pollution situation with ozone as the main and particulate matter as the auxiliary has emerged.