重庆市九龙坡区空气质量状况分析研究

Comparative analysis of air environmental quality in Jiulongpo District of Chongqing

利用2021年监测数据对空气质量状况及变化趋势进行分析,结果表明:PM_(10)、PM_(2.5)、NO_(2)逐时变化规律呈双峰型,O_(3)呈午后单峰型。PM_(10)、PM_(2.5)和NO_(2)月均浓度呈先下降后上升趋势,冬季浓度高于夏季,O_(3)则相反。2017—2021年,PM_(10)和PM_(2.5)浓度呈不显著下降趋势,NO_(2)月和O_(3)浓度呈不显著上升趋势。

Based on the monitoring data of atmospheric environmental quality in Jiulongpo District of Chongqing in 2021,the variation trend of air quality and pollutant characteristics were conducted.With respect to the daily char⁃acteristics of pollutants,PM10,PM_(2.5) and NO_(2) showed two peaks in the morning and evening,while O_(3) showed one peak after noon.The seasonal variation of PM10,PM_(2.5) and NO_(2) expressed high concentrations in summer and low concen⁃trations in winter,while O_(3) exhibited the opposite trend.The annual concentration of PM10 and PM_(2.5) showed an in⁃significant downward trend over the past five years,while O_(3) and NO_(2) gradually increased.