Abstract：With the rapid development of urbanization and economy, China has become the world's third largest emitter of sulfur dioxide (SO2), posing severe challenges to human health and the sustainable development of social and economic. Based on OMSO2e products, this paper analyzed the spatial and temporal changes of atmospheric SO2 column concentrations in China from 2005 to 2020 and used MEIC emission data and socio-economic data to explore the main factors affecting SO2 changes in China's 10 economic regions. The results show that:(1) Over the past 16 years, SO2 has decreased in a fluctuation way, with a slight increase in Xinjiang and the Qinghai-Tibet Plateau, while other regions showed a significant decreasing trend. (2) SO2 exhibited large inter-annual variation and displayed a spatial distribution pattern of high levels in the east and low levels in the west. The northern coastal areas (NC) and the middle reaches of the Yellow River (MYR) had the highest annual average concentrations and coefficients of variation. (3) SO2 was positively correlated with the proportion of industrial sources, residential sources, power sources, transportation sources and secondary industries in GRP while it was negatively correlated with population density, industrial emission gas treatment facilities and associated expenses. (4) Changes in emission sources were the main factors influencing variations in SO2. This paper provides a theoretical basis and reference for formulating relevant emission reduction policies and ecological environmental protection in China.
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