Evaluation of Particulate Matter 2.5 Pollution Prevention and Control Effectiveness around Coal-fired Power Plants in Jiangsu Province, China based on Remote Sensing Data

¹ School of Electric Power Engineering, Nanjing Institute of Technology, China
² Beijing Smartchip Microelectronics Technology Company Limited, China

^* Corresponding author: chenjun@njit.edu.cn

Abstract

Based on the China High-resolution Air Pollution near-surface air pollutant remote sensing dataset, the spatiotemporal variation characteristics of PM2.5 and four chemical components around 6 coal-fired power plants in fine particulate matter pollution hotspots in Jiangsu Province, China from 2016 to 2020 were analyzed. Combined with the power plant installed capacity and the power generation data is studied from three perspectives: inter-annual characteristics, seasonal changes and trend analysis. The results show that the concentrations of PM_2.5 and chemical components (Cl^-, NH₄⁺, SO₄^2-, NO₃^-) around major coal-fired power plants in Jiangsu Province have dropped significantly, with an average annual reduction of 3.43, 0.12, 0.32, 0.54 and 0.54μg/m₃ respectively.The seasonal variation characteristics of chemical components are obvious, the seasonal variation of NO₃^- is the most significant, and the proportion of SO₄^2- reaches its peak in summer. Spatial heterogeneity is significant. Compared with the northern region, the proportion of NO₃^- in the three power plants in southern Jiangsu is 3 percentage points higher overall, and the concentrations of SO₄^2- and NO₃^-have dropped even more. In addition, secondary inorganic aerosols (SIA) represented by NH₄⁺, SO₄^2-, and NO₃^- have become the main driving factors of PM2.5 pollution from coal-fired power plants in areas along the Yangtze River in Jiangsu Province, among which NO3- is the main cause of PM2.5 pollution around coal-fired power plants in Jiangsu Province. The most important secondary components highlight the importance of NH³ and NO_X control for the future prevention and control of PM2.5 pollution from coal-fired power plants in Jiangsu Province, China.