Impact of temporary emission reduction from a large-scale coal-fired power plant on air quality

Abstract

This study evaluated the impact of the largest point source of particulate matter ≤2.5 μm (PM2.5) in South Korea (the coal-fired power plant) on the air quality in the southeastern region based on the transient reduction (30% less than the previous month) in coal consumption by the power plant. The impacts of the power plant during the period of coal consumption reduction were assessed based on an in-depth analysis of the forward air mass trajectory, such as the effects of meteorological parameter changes (temperature and relative humidity) on aerosol chemistry and long-range transport, and changes in anthropogenic emissions from May through June 2017. The study determined that the emission reduction from the coal-fired power plant resulted in a significant decrease in the local and regional concentrations of PM2.5, as well as the major inorganic components. The effects of the coal-fired power plant on the air quality downwind were different between local and regional areas, with a higher impact in the regional area due to the significant secondary aerosol formation. Keywords: Power plant, PM2.5, SO2, NOX, Inorganic ions, Air mass trajectory