Reseach on the Trend of Air Quality Changes in Wanzhou District of Chongqing from 2009 to 2022
Understanding the air quality in Wanzhou district of Chongqing is positive significance to the ecological environment protection of the Three Gorges Reservoir area.Through Mann-Kendall non-parametric test about the measured data from the concentration of PM10,SO2 and NO2 during 2009-2022 and the concentration of PM2.5,O3 and CO during 2017-2022,we analyzed the characteristics of air quality change in long time series.The results show that,the concentration of PM10,PM2.5,SO2 and CO show a decreasing trend,while the concentration's variation trend of O3 and NO2 is not obvious,the upward trend about concentration ratio of NO2 to SO2 is obvious,atmospheric oxidation is enhanced.This indicates that the prevention and control of NO2 and ozone precursor should be strengthened.PM2.5 is the chief pollutant affecting of air quality,followed by O3.The impact of PM2.5 is significant in winter and autumn;the impact of O3 is significant in summer and spring.
Wanzhou district of Chongqingair qualityMann-Kendallcharacteristics of changelong time series
NETL
NSTL
万方数据
