Abstract: Based on the monitoring data of PM2.5,PM10,SO2,and NO2 concentrations released by theChina National Environmental Monitoring Station from 2016 to 2020,four typical coastal cities with ac-tive economy ( Tianjin,Qingdao,Shanghai and Ningbo) were selected for analysis from the aspects ofgeographical location,climate,industrial structure,transportation and GDP. The results showed that re-gional geographic location and climate had an impact on the concentration distribution of atmosphericpollutants. The concentrations of PM2.5,PM10 and SO2 in winter in the northern two cities were higherthan those in the southern two cities.The highest average values in 2020 in the northern two cities were2 times,1.8 times and 1.4 times as much as those of the southern cities,respectively. The average PM10concentration in Qingdao in winter was the highest among the four cities,but in summer it was muchlower than that in Tianjin and was similar to Ningbo,which had the lowest concentration. Transporta-tion,temperature,and precipitation had different impacts on the concentrations of air pollutants. Affected by the epidemic,there was a significant difference between the transportation capacity ofShanghai in 2020 and 2019. As a result,in Shanghai,the fluctuation amplitude of the NO2 concentrationin the winter of 2020 is 1.5 times as much as that in the winter of 2019.The impact of precipitation onseasonally arid cities was greater than that on humid cities. The impact of precipitation on the northerntwo cities was negatively correlated,and the impact on the southern two cities was weakly correlated.Taking the unit GDP as the comparison benchmark value,Shanghai has the smallest comparison value ofeach pollutant concentration. Taking Shanghai as the benchmark value,the maximum comparison values ofPM2.5,PM10,SO2,and NO2 concentrations in northern cities were 4.16,4.61,3.82 and 2.91,respectively. Close-