Study On The Characteristics Of Ozone Change And Pollution Control In Guiyang City

my country’s economy is developing rapidly,and air pollution has become the key to my country’s environmental pollution.Near-surface ozone（O₃）is the main factor causing photochemical pollution.High-concentration ozone will pose a major threat to the atmospheric environment and human life.Under the situation that the national air index has declined,only O₃ concentration has gradually increased,and the treatment of O₃ pollution has Urgently.Guiyang’s air environmental quality issues have gradually received more attention,and O₃ pollution has become the second biggest culprit affecting the air quality of Guiyang City.Therefore,this paper studies the problem of O₃ pollution in Guiyang City,analyzes the pollution characteristics of O₃ and its precursors,and lays a foundation for the treatment of O₃ pollution in Guiyang City.This paper studied the data of 10 nationally controlled air quality automatic monitoring stations in the urban area of Guiyang from 2013 to 2018,and explored the influence characteristics of O₃ pollution concentration levels,temporal and spatial changes in the past 6 years,and meteorological factors in Guiyang City;Change the law of nitrogen oxides in the body,explore the influencing factors of O₃ and nitrogen oxides;at the same time,conduct spot sampling in Huaxi District based on ozone precursors VOCs,through the characteristics and source identification of ozone precursors from the collected VOCs samples,put forward O₃ pollution control measures and prevention and control measures.From 2015,Guiyang City began to experience atmospheric pollution with O₃ as the main pollutant.From 2013 to 2018,the O₃ concentration in the urban area of??Guiyang City increased first and then decreased.The time point is the seasonal change of O₃ concentration in Guiyang City during the 2016 season From high to low,it is arranged in spring,autumn,summer,and winter in sequence.The peak monthsappear in April and May,and the concentration in winter is the lowest in three months,which has a great impact on the heating season.The diurnal variation shows a single-peak distribution,with the highest daily value after 14 o’clock,which is obviously affected by solar radiation and anthropogenic sources.Compared with similar cities in Guiyang,the annual average O₃ concentration ranks ahead.The concentration of O₃ in the inner city of Guiyang is higher than that in the suburbs.In terms of meteorological effects,overall,relative humidity and wind speed are inversely proportional to changes in the concentration of O₃,while temperature is positively correlated with it.From 2013 to 2018 in Guiyang,the number of motor vehicles and the number of enterprises continued to increase,and the nitrogen oxides emitted continued to increase.The average concentration of NO2 was high in winter and low in summer,and the seasonal change was obvious.The daily change in NO2 concentration was inversely correlated with O₃,peak Appeared at 10 am.The concentration of nitrogen oxides in the urban area of Guiyang is relatively high,while that in the suburbs is relatively low.It is seriously affected by human factors and is a typical urban feature.At the same time,the formation of nitrogen oxides and O₃ in Guiyang is obviously affected by the monsoon and the factors of regional transmission.Based on the data of 56 species obtained from the VOCs sampling site in Huaxi District of Guiyang City,the concentration changes of each species were analyzed,and the LOH and OFP of each species were calculated.The dominant species were judged by comparing the concentration of each species in the atmospheric VOCs,LOH and OFP.The ratio method is used to determine the source of pollution and the prevention and control measures are proposed.In the VOC of Huaxi District,Guiyang City,the seasonal change of concentration is winter > autumn > spring > summer,which is matched with the seasonal change.The concentration of alkane is the largest,and the hydrocarbon components are relatively stable.Aromatic hydrocarbons have the strongest potential in Huaxi District of Guiyang City.Benzene series have a significant impact in autumn and winter,while isoprene has a greater impact in summer and autumn.The highest contribution of chemical reactivity is olefins,whichare mainly affected by ethylene,propylene and 1-butene,and isoprene is also affected by summer and autumn seasons,and its reaction activity accounts for a large proportion.Various comparisons show that the key species are mainly alkane ethane,propane,isobutane,n-butane,isopentane,n-pentane;olefin isoprene,propylene,1-butene,ethylene,trans-2-butene;para-xylene,benzene,toluene of aromatic hydrocarbons;and acetylene.At the same time,by ratio analysis,the main sources of influence in Huaxi District,Guiyang City are: biomass and biomass combustion,coal combustion,NG,LPG,organic solvents,architectural paint volatilization,and vehicle and plant emissions.Based on the Huaxi District,it proposes prevention and control measures for O₃ pollution in Guiyang City,such as: standardizing VOCs and NOx emissions from petrochemical coal-fired enterprises,improving the efficiency of oil and gas recovery at gas stations,and promoting the use of clean energy for healthy travel.