重庆市渝中区环境空气中NO2浓度时空分布特征及污染分析OACSTPCD

In order to explore the impact mechanism of NO2 concentration in the atmospheric atmosphere in Yuzhong District,the statistical method and SPSS linear regression analysis method were adopted in this paper.Based on the automatic monitoring data of NO2 concentration in three air monitoring stations in Yuzhong District,Chongqing from 2018 to 2022,the spatial and temporal distribution characteristics of NO2 concentration in Yuzhong District were analyzed,and the effects of meteorological parameters and pollution sources on NO2 concentration were also analyzed.The results showed that the average annual NO2 concentration,days of NO2 exceeding the standard and the pollution load of the three stations and the whole region decreased,while the annual average concentration ranking of the three sites showed an upward trend,with the ranking in the entire district being lower;the seasonal distribution was obvious,with the highest concentration in spring,followed by autumn and winter,and the lowest in summer;and the hourly concentration decreased from 0:00 to 6:00,increased from 6:00 to 9:00,decreased from 9:00 to 16:00,and finally increased again.There were significant differences in spatial distribution,with the highest NO2 concentration at the Shangqingsi point,followed by the Panjiaping point,and the Fotuguan point.According to the above results,it can be concluded that the main meteorological parameters that affected the concentration of NO2 in the ambient atmosphere included pressure,temperature,and relative humidity;the main pollution sources affecting NO2 concentration in Yuzhong District was a mobile source,and there was a strong positive correlation between the concentration of NO2 and the traffic flow.This study was an important scientific basis for the prevention and control of air pollution in Yuzhong District in the future.