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In recent years,the air quality in China has been greatly improved with the rapid development of economy and the promotion of energy saving and emission reduction.But haze weather has been happening all the time in Northeast China.According to the city air quality ranking of 2018,Changchun is now ranked 28th,the composite index is 4.07,the main pollutant is PM2.5..In view of the urban particularity of Changchun area,the main road around the University Town of Jingyue Development Zone was selected to measure the concentration of PM2.5 from November to January 2018.At the same time,the comprehensive analysis of the monitoring data of Changchun area was carried out by comparing the test parameters with the China Environmental General Station,and compared with the experimental examination.It was found that the change of PM2.5 concentration in December was the most intense.Based on the parameters of Changchun area in the data of China Air quality online Monitoring platform,it is found in this paper that PM2.5,the key factor affecting Changchun air quality in the past winter,is due to the stagnation of vehicles and the sudden increase in the number of vehicles.Experimental data show that this factor has a certain effect on atmospheric PM2.5,and the concentration of PM2.5 directly determines the air quality grade.In this paper,the concentration of pollutants in different periods of time is compared and analyzed,and it is found that the concentration of pollutants is the highest in the whole day.The interval occurs at both early peak and early morning hours.The event log of the comprehensive experiment shows that the exhaust emissions of large vehicles can affect the trend change of PM2.5 concentration more effectively.Vehicle congestion and stagnation caused by engine start-up emissions of pollutant concentrations and midnight truck emissions are comparable.Finally,the paper analyzes the current standards and present situation of automobile exhaust detection in China,and puts forward constructive countermeasures according to the current relevant policies of our country.