2001-2020年合肥市空气质量变化趋势研究

Study on the Change Characteristics of Air Quality in Hefei from 2001 to 2020

为系统分析合肥市长时间序列空气质量变化特征,对合肥市2001—2020年SO_(2)、NO_(2)和PM_(10),以及2013—2020年CO、O_(3)和PM_(2.5)的浓度特征开展研究。采用Mann-Kendall(M-K)时间趋势检验法分析了6项污染物的时间变化规律,同时考虑了人为活动对污染物小时浓度的影响。结果表明,PM_(2.5)和O_(3)是目前影响合肥市空气质量的首要污染物。2014年以来,合肥市PM_(10)、PM_(2.5)、CO和SO_(2)年均浓度均呈逐年下降趋势,但NO_(2)和O_(3)污染有加剧趋势。合肥市SO_(2)和颗粒物浓度表现为冬春季节高、夏秋季节低;O_(3)浓度变化趋势与之相反;NO_(2)和CO浓度呈秋冬季节高、春夏季节低。

In order to systematically analyze the characteristics of long-time air quality changes in Hefei City,this paper studied the concentration characteristics of SO_(2),NO_(2) and PM_(10) from 2001 to 2020 and CO,O_(3) and PM_(2.5) from 2013 to 2020.The Mann-Kendall(M-K)time trend test method was used to analyze the time variation of six pollutants,and the impact of human activities on the hourly concentration of pollutants was analyzed.The results showed that PM_(2.5) and ozone are currently the primary pollutant affecting the air quality of Hefei.Since 2014,the annual average concentrations of PM_(10),PM_(2.5),CO,and SO_(2) were declining year by year,but NO_(2) and O_(3) pollution were increased.The concentrations of SO_(2) and particulate matters in Hefei were high in winter and spring and low in summer and autumn,and the trend of O_(3) was the opposite.The concentration of NO_(2) and CO were high in autumn and winter and low in spring and summer.