Study On The Characteristics And Control Strategies Of Ozone Pollution In A City In Northeast China

With the continuous expansion and deepening of the scope and degree of ozone pollution in China,and the great harmfulness of ozone pollution,ozone pollution has been widely concerned,ozone pollution has become one of the important factors restricting the environmental air quality in China.So the characteristics and source of ozone pollution in the city has the important practical significance,this paper selected hinterland of a typical city in northeast China as the research object,main characteristics,influence factors of ozone pollution in cities and precursor content sources is studied,and put forward the urban ozone pollution control strategy,in order to provide feasibility for China’s northeast city ozone pollution prevention advice.It is found that ozone pollution in northeast China is increasing year by year.Based on the analysis of the daily and annual variation laws of ozone pollution,it is concluded that the daily variation of ozone concentration presents a“single peak”trend,and the peak value appears around 15 PM.The annual variation also showed a“unimodal”trend,the highest in summer,the second in spring and autumn,and the last in winter.On the whole,strong solar radiation,higher temperature,relatively low humidity and relatively low wind speed are conducive to the generation of ozone pollution.Research on the relationship between ozone and NO_xand particulate matter found that ozone and NO_xare positively correlated,and particulate matter is negatively correlated.On the basis of VOCs monitoring data in the city,based on the maximum increment coefficient of reactivity of ozone generation potential method to estimate the conversion of VOCs generated O₃ability,it is concluded that the average amount of ozone generation potential for VOCs 26.5 ug/m³,the amount of ozone generation potential olefin biggest（18.5 ug/m3）,accounted for 70.1%,followed by alkane（5.2 u g/m³）and aromatic hydrocarbon（2.4 ug/m³）,19.8%and 10.1%respectively.In general,the potential of ozone formation is:olefin>alkane>aromatic hydrocarbon.The EKMA equivalent curve is drawn,and it is determined that within the urban area,O₃pollution is dominated by VOCs.In order to control ozone pollution,VOCs emission,especially olefin emission,should be mainly controlled.The orthogonal matrix factor model（PMF）was used to analyze the source of VOCs pollution.The results showed that the contribution of oil and gas volatilization source,plant emission source,industrial production source,transportation source and solvent use source were 23.2%,10.0%,50.6%,5.7%and 10.5%.On the basis of the above research,this paper reviewed a series of policies and standards on the prevention and control of air pollutants in China,combined with the prevention and control of ozone pollution in the city in recent years,and put forward some suggestions on the control strategy of ozone pollution in cities in Northeast China.First,we will carry out targeted emission reduction for industrial enterprises and do a good job in the management of industrial parks and enterprise clusters.Second,vigorously carry out the source substitution,deepen the technological reform;Three is to strengthen VOCs governance related laws and regulations publicity,organize enterprises to carry out their own monitoring of VOCs;Fourth,to promote the implementation of more stringent atmospheric emission standards for coal-fired boilers;Five is the preparation of the Northeast China city heavy pollution weather VOCs key industry emergency emission reduction measures.