Study On Characteristics Of Ozone Pollution And Cooperative Control Path In Hefei City

Recentlly,air pollution has become one of the hot topics that cased much attention.As the rapid urbanization and industrialization,The situation of ozone pollution is also getting worse.Due to the strong oxidbillity,ozone could participate in a variety of air pollutants chemical conversion process,and do great harm to human beings and ecological environment.therefore,it is very important to develop the research about prophylaxis and treatment strategy of ozone pollution.This article in Hefei urban area 10 atmospheric observation point on the surface O₃ in the atmosphere and its precursor(NO_x,CO,PM_2.5.5 and VOCs)are analyzed in observation,combined with the meteorological conditions,the study of spatial and temporal variation of O₃ concentration.The main results are as follows.?1?The ozone concentration of 2018 was analyzed by means of statistical analysis.The results show that,the number of days in the air in Hefei was decreased.In2018,the maximum 8-hour concentration of ozone day is 28 days and exceeded in7.67%.The daily Variation of ozone concentration is unimodal.The highest value of ozone appears around 15:00.There are obvious“weekend effects”in Hefei,which is more influenced by human activities.Season the concentration change of summer>spring>autumn>winter,each site of seasonal variation are basically the same.?2?Through the analysis of ozone and meteorological factors,it is found that the relationship between ozone concentration and meteorological factors is very close.At high temperature,low wind speed,the wind direction is northeast wind,the relative humidity is between 50%and 60%and there is no precipitation.In the case of high concentration ozone is likely to occur.Through analysis of ozone precursor contaminants,it is found that the change of NO-NO₂-NO_x,CO and PM_2.5.5 is the bimodal curve.Consistent with the peak hours,it can reflect that the nitrogen oxide concentration is mainly affected by vehicle exhaust pollution.?3?44 kind of VOCs could be measured by Monitor VOCs.The average volume fraction of alkanes accounts for 45.45%,olefins account for 37.73%,alkynes account for 3.41%,and aromatic hydrocarbons account for 13.41%.The contribution to OFP is14.99%for alkane,71.10%for olefins,0.49%for alkyne,and 13.42%for aromatic hydrocarbons.Through the simple ratio of VOCs/NO_x concentration,it is analyzed that the ozone generation in Hefei City is controlled by VOCs.?4?This paper proposes corresponding control measures from three aspects:pollution source control,enhanced pollutant monitoring and policy formulation.