摘要
1.Introduction In recent years,the air quality in China has improved significantly.In many cities,however,the concentration of fine particulate matter(PM_(2.5))remains higher than the secondary-level national ambient air quality standard(NAAQS level-2,35μg·m^(-3),GB3095-2012[1])and much higher than the first-level NAAQS(15μg·m^(-3),GB3095-2012[1])and the World Health Organization(WHO)air quality guidelines(5μg·m^(-3)).
基金
financially supported by the National Key Research and Development(R&D)Program of China(2017YFC0211100)
the consulting research project of the Chinese Academy of Engineering(2020-XY-22)
the Cultivating Project of Strategic Priority Research Program of Chinese Academy of Sciences(XDPB1901 and RCEES-CYZX-2020).
