Observation and analysis of near-surface atmospheric aerosol optical properties in urban Beijing

- Aerosol optical properties from 2009 to 2010 at an urban site in Beijing were investigated.
- Aerosol scattering and absorption were high in autumn and winter while low in summer and spring.
- Regional pollutants from south and southeast and local emissions dominated the aerosol pollution.
- Daily PM2.5 mass concentration should be controlled to lower than 64 μg/m3.