2001—2020年合肥市空气质量变化趋势研究

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SO₂、NO₂和PM₁₀,以及2013—2020年CO、O₃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O₃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PM₁₀、PM_2.5、CO和SO₂年均浓度均呈逐年下降趋势,但NO₂和O₃污染有加剧趋势。合肥市SO₂和颗粒物浓度表现为冬春季节高、夏秋季节低;O₃浓度变化趋势与之相反;NO₂和CO浓度呈秋冬季节高、春夏季节低。

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

In order to systematically analyze the characteristics of long-time air quality changes in Hefei City,this paper studied the concentration characteristics of SO₂,NO₂ and PM₁₀ from 2001 to 2020 and CO,O₃ 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 PM₁₀,PM_2.5,CO,and SO₂ were declining year by year,but NO₂ and O₃ pollution were increased.The concentrations of SO₂ and particulate matters in Hefei were high in winter and spring and low in summer and autumn,and the trend of O₃ was the opposite.The concentration of NO₂ and CO were high in autumn and winter and low in spring and summer.