摘要：PM 2.5 air pollution at urban and regional scales is a serious environmental issue in Asia. Developing counties in South and Southeast Asia are facing an especially severe situation with urban PM 2.5 pollution.Also, transboundary air pollution results in high PM 2.5 concentrations over wide regions leeward of thesource country. Additionally, long-range transport of Asian dust aerosols in Northeast Asia and biomassburning in Southeast Asia has resulted in regional haze episodes. This paper provides an overview oftemporal trends, focusing on PM 2.5 pollution in Asian region, ambient standard levels in each country andregional characteristics. It also discusses the way forward toward PM 2.5 mitigation.
