Air Quality Assessment Of Lanzhou City And Analysis Of Variation Characteristics Of Primary Atmospheric Pollutants

Air pollution has become a global social problem.Although the air quality in Lanzhou is improving,it still faces the problems of ozone pollution and nitrogen oxides.In view of this,the level of air quality in different regions of Lanzhou City is comprehensively and objectively evaluated,and the variation characteristics of air pollutants in different regions of Lanzhou City at different periods of time are analyzed in depth.In order to realize the differential management proposed by the Lanzhou City Government,the pollution control is accurate.It is of great significance to continuously and steadily improve the ambient air quality in Lanzhou City.First of all,Lanzhou is divided into three areas:living area,industrial area and control area.The six kinds of atmospheric pollutants of PM_2.5,PM₁₀,SO₂,NO₂,CO and O₃ are evaluated by hour,day and year,respectively.The regional ambient air quality evaluation is carried out,and then the comprehensive evaluation of Lanzhou air quality is carried out,and the absolute and relative conditions of Lanzhou air quality are obtained.According to the standard level of each pollutant,only SO₂reached the standard in three areas,the industrial zone of pollutant PM_2.5,PM₁₀0 and SO₂ was the highest,and the mass concentration of pollutant CO was the highest in the living area.The concentration of O₃was the highest in the control area,and the main atmospheric pollutants in Lanzhou were PM_2.5,PM₁₀0 and O₃.From the point of view of each region,the concentration of pollutants in living area is up to the standard of SO₂,the concentration of pollutants in industrial area is up to the standard of SO₂ and CO,and the concentration of pollutants in control area is up to the standard of SO₂,NO₂ and CO.The relative level of air quality is the control area,living area and industrial area.Secondly,aiming at the main atmospheric pollutants in Lanzhou city,the characteristics of PM_2.5,PM₁₀0 and O₃ mass concentration are obtained by analyzing the main atmospheric pollutants in different seasons and periods.The concentration of particulate matter in winter is the highest and the lowest in summer from season to season,the peak of concentration usually appears in the morning and noon.The concentration of O₃ is higher in spring and summer and lower in autumn and winter than in seasons,and the peak value of concentration is easy to appear in the lower part of the season from high to low in order of control area,industrial area and living area,in season,it is higher in spring and summer,and lower in autumn and winter.Noon.Finally,according to the results of air quality evaluation and the change characteristics of main pollutants in Lanzhou City,the paper puts forward some suggestions for precise pollution control and differential control.The main pollutants are particulate matter and ozone?O₃?,and in industrial areas and winter to strengthen the control of particulate matter,the first time of the control of morning and noon;In the control area and in spring and summer to strengthen the control of O₃,and the control time preferred afternoon.