Analysis of Ozone Pollution Characteristics and the Impact Factors in Henan Province
Dong Zhenhua
Qi Yiling
Wang Rui
Tian Li
Wu Lu
Kong Haijiang
Abstract：Based on air quality monitoring data,conventional meteorological observation data,and air pollution reanalysis data of 18 prefectural cities in Henan Province from 2017 to 2020,the O3 pollu-tion characteristics and impact factors of Henan are analyzed.The results show that the annual average O3 concentration in most cities of Henan exceeded the standard during 2017-2019,but the number of cities with O3 concentration exceeding the standard was significantly reduced in 2020.The most serious areas with O3 concentration exceeding the standard were in the northwest of Henan.The annual average con-centration of O3 pollution in Henan shows a gradually decreasing trend from northwest to southeast.There was the most severe ozone pollution in 2017,the most O3 pollution days in 2019,and the lightest O3 pol-lution and the least pollution days in 2020.The areas with higher daily O3 exceeding rates are distributed in the northern and central regions,and areas with the lowest O3 exceeding rates are Sanmenxia or Xin-yang.The highest ozone concentration in a day occurs at 15:00 or 16:00,and the lowest value mostly at 07:00 in summer(08:00 in winter).The diurnal variation range of O3 is the largest in summer and the smallest in winter.The EOF analysis shows that the O3 concentration during 2017-2019 in Henan pres-ents a ladder-pattern of high in the west and low in the east.The time coefficient is positive from April to September in 2017,and from April to early October in 2018 and 2019.The spatial distribution character-istics of O3 EOF first mode and the corresponding time coefficients are consistent with the actual situation.The temperature has the highest correlation with the O3 concentration with the correlation coefficient sur-passing 0.7.The O3 concentration is positively correlated to air temperature and sunshine hours,but neg-atively correlated to pressure,relative humidity,CO concentration,NO2 concentration and PM2 5 concen-tration.When the probability of O3 concentration exceeding the standard is 80％in June,the maximum temperature range is 30.7-37.0 ℃,the relative humidity range is 36.3％—70.7％,the sunshine hours range is 0.9-11.8 h,and the pressure range is 971.2-1000.5 hPa.
Keywords：ozone concentrationexceeding standard daysdaily exceeding standard rateimpact factor
Publication Date：2025-05-30
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：9( 60-68 )