Yunfei Wu

TL;DR: In this article, the authors show that black carbon aerosols play a key role in modifying the PBL meteorology and hence enhancing the haze pollution in megacities in China.

TL;DR: Ship emissions, a source factor previously ignored in making emission control policies in the Pearl River Delta region of south China, were among the top contributors to PM2.5 at both sites, accounting for >17% of PM2-5 mass concentrations.

TL;DR: The results indicate that, during the five winter haze episodes, the regional transport from the south was the major reason for the initial-stage PM2.5 increase, while heterogeneous reactions dominated the later elevation.

TL;DR: The light absorption coefficient of methanol-soluble BrC at 365 nm was found to correlate strongly with both parent polycyclic aromatic hydrocarbons and their carbonyl oxygenated derivatives in all seasons, and fractional solar absorption by BrC relative to element carbon in the ultraviolet range is significant during winter.

TL;DR: It is concluded that traffic-related emission dominates the health risks by particulate trace elements during low pollution days, while coal combustion becomes equally or even more important during moderate and severe pollution days.