Diagnostic Analysis of Air Pollution and Meteorological Elements in Xiaoshan Hangzhou During the Asian Games

Ma Fenghua; Zhang Zhifei; Geng Di; Zhong Yicheng; Dong Jianrong; Lu Chaoqun; Wang Qin

doi:10.16765/j.cnki.1673-7148.2025.05.009

Abstract：To investigate the variation characteristics of air pollutants and the influence of meteoro-logical elements on the pollutant concentrations in Xiaoshan District,Hangzhou,during the Asian Games period,this paper analyzes the relationships between pollutant variations and meteorological elements in Xiaoshan by using the observation data from Xiaoshan Meteorological Station and Environmental Monito-ring Center from September 20 to October 10 during 2015-2022 as well as the Origin and Spearman rank correlation statistical analysis methods.The results demonstrate that during the same period of Asian Games from 2015 to 2022,the air quality in Xiaoshan,Hangzhou,was mainly excellent or good,with an excellent and good rate of 81.3%.Ozone(O3)was the primary pollutant,and the daily variation of its concentration exhibited a single-peak pattern,with the peak value occurring between 13:00 and 15:00 and the trough value at 06:00.Moreover,the concentrations of O3 were significantly higher in the day-time than over the nighttime,indicating its close relationship with solar radiation.In addition,different from the variation characteristics of O3 concentration,the daily variation of NO2 and particulate matter(PM2.5 and PM10)concentrations showed a double-peak and single-valley pattern.Further analysis shows that the meteorological elements strongly correlated to O3 concentration are relative humidity,temperature and sunshine hours.When the temperature is between 28℃and 35℃,the relative humidity is between 40%and 60%,and the hourly sunshine duration reaches 0.8 to 1.0 hours for 2-6 consecutive hours,light pollution or worse air quality conditions are more likely to occur.These results can preliminarily serve as meteorological warning indicators for determining O3 pollution.