文山州城市环境质量时空分布特征分析

Spatio-temporal Distribution Characteristics of Urban Environmental Quality in Wenshan Prefecture

为评价文山州城市环境空气质量状况,选取文山州2020年环境空气质量常规监测指标日均浓度值,对污染物时空分布特征进行分析。结果表明,2020年,文山州环境空气质量总体较好,但部分时段部分县市污染天气隐患依然存在。影响文山州环境空气质量的主要污染物为PM_(2.5)、O_(3)和PM_(10)。污染主要出现在3—5月和11月,砚山县和马关县浓度较常年略有上升,其余各县均较常年浓度呈现下降,广南县空气质量相对较差,西畴县空气质量相对较好,O_(3)、PM_(2.5)浓度变化与湿度的相关性最明显,本地及东南亚生物质燃烧对文山州环境空气污染具有一定影响,以PM_(2.5)、O_(3)为主的复合型、区域型污染特征有所显现。

In order to evaluate the environmental air quality of wenshan,the average daily concentration of the ambient air quality routine monitoring index in 2020 was selected to analyze the spatio-temporal distribution characteristics of pollutants.The results showed that the ambient air quality in Wenshan Prefecture was generally good in 2020,but the weather pollution hazards still existed in some counties and cities in some periods.The main pollutants affecting the ambient air quality in Wenshan were PM_(2.5),O_(3) and PM_(10).The pollution season mainly occurred in March to May and November.The concentration in Yanshan County and Maguan County increased slightly,while the concentration in other counties decreased.The air quality in Guangnan County was relatively poor,and the air quality in Xichou County was relatively good.The correlation between O_(3) and PM_(2.5) concentration change and humidity was most obvious.Local and Southeast Asian biomass combustion had a certain contribution to air pollution in Wenshan,which has caused the compound and regional pollution features mainly PM_(2.5) and O_(3).