Research on the Change of Sulfur DioxideMass Concentration in Jilin Province, China

Using the monitoring data and meteorological data of SO 2 and other pollutants from nine cities in Jilin Province between 2016 and 2021, analyze the annual and monthly variations and spatial distribution of SO 2 concentrations across the province, as well as the related impacts from other environmental factors.The results showed that: (1) During the six-year period, no annual exceedance of the standard limit was observed in the entire province.There was a significant decrease in SO 2 concentrations across Jilin Province from 2016 to 2018.There were 5 days with excessive daily values in the whole province, all of which occurred in Baishan.Although SO 2 levels in the province remained low from 2019 to 2021, they were 16.0% and 22.2% higher than the national average in 2020 and 2021, respectively.According to the statistics of SO 2 -24h-98, there were severe exceedances in the entire province from 2016 to 2017.The annual trends of relative humidity and wind speed are not conducive to reducing SO 2 concentrations, while the annual changes in precipitation and temperature have a favorable effect.The monthly average concentration of SO 2 across the province exhibits a "decreasing first and then increasing" trend.It is higher in January and December and reaches its lowest point in August.(2) The geographical distribution of SO 2 concentrations across the province shows high values centered in the southern and central regions, while low values are centered in the northern and eastern regions.It shows a zonal distribution from southeast to northwest.The spatial distribution of SO 2 -24h-98 in the province