Multi-dimension apportionment of clean air ”parade blue” phenomenon in Beijing
The mass concentration and major chemical components of fine particulate matter were measured before,during and after Beijing”s massive parade commemorating 70th anniversary of the Chinese Victory in World War II on September 3,2015.Regional emission inventory,positive matrix factorization(PMF),observations from space and backward air mass trajectories were jointly applied to identify the major pollution sources and their temporal and spatial variations.The contributions of emissions their variations and the meteorological conditions related to the ”parade blue” phenomenon in Beijing and its surrounding areas were investigated in detail.The main cause of the decreased PM2.5 mass concentration was attributed to the absolute reduction in emissions of primary air pollutants.The chemical composition of PM2.5 varied significantly before,during and after the parade.Fugitive dust particles were well controlled,the secondary formation of PM2.5 was reduced along with the controlled gaseous precursors” emissions from vehicles and industrial sources during the temporary intensified control period.During the parade period,the SO2 and NO2 column concentrations in Beijing and the surrounding areas decreased sharply,indicating that the coordinated reduction in primary emissions from the surrounding areas of Beijing played an important role in lowering the ambient concentration of SO2 and NO2 and accordingly lowered PM2.5 and improved the regional air quality.A comparison of the temperature,humidity,and wind speed and direction during the same periods in 2014 and 2015 showed that the meteorological conditions positively influenced the achievement of ”parade blue”.
PM2.5 Parade Blue in Beijing Emission reduction Air quality Source apportionment meteorological conditions
Yifeng Xue Yong Wang Xuefeng Li Hezhong Tian Lei Nie Xiaoqing Wu Junrui Zhou Zhen Zhou
State Key Joint Laboratory of Environmental Simulation & Pollution Control,School of Environment,Bei State Key Joint Laboratory of Environmental Simulation & Pollution Control,School of Environment,Bei National Engineering Research Center of Urban Environmental Pollution Control,Beijing Municipal Rese State Key Joint Laboratory of Environmental Simulation & Pollution Control,School of Environment,Bei
国内会议
北京
英文
1-25
2017-09-13（万方平台首次上网日期，不代表论文的发表时间）