Jing Zheng

TL;DR: A periodic cycle of PM episodes in Beijing is demonstrated that is governed by meteorological conditions and characterized by two distinct aerosol formation processes of nucleation and growth, but with a small contribution from primary emissions and regional transport of particles.

TL;DR: The results explain the outstanding sulfur problem during the historic London Fog formation and elucidate the chemical mechanism of severe haze in China, and suggest that effective haze mitigation is achievable by intervening in the sulfate formation process with NH3 and NO2 emission control measures.

TL;DR: The results indicate that BC under polluted urban environments could contribute significantly to both pollution development and large positive radiative forcing, implying that reduction of BC emissions under polluted environments achieves a cobenefit in simultaneously controlling air pollution and protecting climate, especially for developing countries.

TL;DR: In this paper, the particle phase state was investigated by measuring particle rebound fraction f in the highly polluted atmosphere of Beijing, China, and the particles changed from rebounding to adhering when the ambient relative humidity (RH) increased above 60%, suggesting a transition from the semisolid to liquid state.

TL;DR: The results reveal that synergetic oxidation of vehicular exhaust leads to efficient formation of UFPs under urban conditions, and imply that reduction of primary particles or removal of existing particles without simultaneously limiting organics from automobile emissions is ineffective and can even exacerbate this problem.