Analysis of Pollution Characteristics and Influencing Factors of Main Pollutants in the Atmosphere of Shenyang City

Air pollution is one of the most concerning environmental problems in cities. Hourly data on pollutant concentrations from 11 automatic atmospheric monitoring stations and meteorological data in Shenyang from 2017 to 2019 were used to analyze the spatio-temporal variation rules of CO (carbon monoxide), SO2(sulfur dioxide), NO2(nitrogen dioxide), O-3(ozone), PM(2.5)and PM10(PM particles with an aerodynamic diameters of not more than 2.5 mu m and 10 mu m) and their relationships with meteorological parameters. Meanwhile, the regional transmission route of pollutants was analyzed by the hybrid single particle Lagrangian integrated trajectory (HYSPLIT) model. The results showed that the concentration of O(3)in the northern area of the city was higher than that in the south; CO, SO(2)and NO(2)were relatively high in the urban center; and PM(2.5)and PM(10)were relatively high in the southwest. The average concentration of pollutants was lowest in 2019. The concentration of O(3)was the highest in spring, while CO showed no significant variations between different seasons. The remaining pollutant concentrations appeared to be high in winter and low in summer. The cumulative concentrations of the six pollutants were the highest in March, and relatively low in July-September. The diurnal concentration variations of O-3, CO and SO(2)exhibited a "single peak," while others showed a "double peak and double valley." Temperature was positively correlated with O(3)concentration and negatively correlated with others. Wind speed was negatively correlated with the concentration of PM2.5, NO2, and O-3. The air quality of the main urban area in spring and summer was mainly affected by the coastal air flow, while it was mostly affected by the northwest air flow in autumn and winter.