中国北方地区农村家庭清洁取暖政策的汞减排效益评估

To quantify the effects of mercury (Hg) emission reductions from the rural household cleaner heating policy (CHP) in northern China, the air pollutants emission inventory method and the GEOS-Chem model were employed to develop the Hg emission inventory and simulate Hg deposition reduction in the key regions during the 13th Five Year Plan period. Results show that the implementation of the CHP had avoided 59.65million tons of residential coal consumption and 10.54tons (Uncertainty Interval: -9.65%~6.94%) of Hg emissions in the study regions. More specifically, the Hg⁰, Hg^Ⅱ and Hg_p emission declined 8.64tons, 1.79tons and 0.11tons, respectively. The CHP programs of coal-to-gas, coal-to-electricity, as well as the other heating energy transition technologies contributed 51.20%, 38.02% and 10.78% of the total Hg reduction, and the CHP avoided 0.49tons of Hg deposition in key regions. Meanwhile, CHP’s spillover effect reduced Hg deposition by 0.66tons in the area around the key regions. Optimization strategies were proposed to further reduce Hg emissions and promote rural energy transition in the future.