北京冬季PM_(2.5)中元素碳、有机碳的污染特征

Characteristics of Organic Carbon and Elemental Carbon in PM_(2.5) in Beijing in the Winter

通过2003年1月对北京市区PM2 5中元素碳(EC)、有机碳(OC)连续测量,分析了其污染特征。监测资料表明,北京市区PM2 5中ρ(OC)高于ρ(EC),它们多在夜间高、白天低,且变化趋势大致相同。北京市区冬季ρ(OC) ρ(EC)的值较低。

Pollution characteristics of element carbon(EC) and organic carbon(OC) in PM_(2.5) are analyzed based on the continuous measurement in January 2003.The results show that OC has a higher concentration than EC on average level.Both OC and EC are usually high at night, and low during the day with a similar variation.The ratio of ρ(OC)/ρ(EC) is small in Beijing in the winter.