2016年某重大活动期间杭州市PM_(2.5)组分及来源变化研究

Chemical and source characteristics variation of PM_(2.5) in Hangzhou City during an important event in 2016

为评估杭州市某重大活动期间管控措施在改善空气质量方面的有效性,利用单颗粒气溶胶飞行时间质谱仪分析了杭州市2016年该重大活动期间和2015年同期PM_(2.5)的组成及来源。结果表明:相比2015年同期,2016年监测期间PM_(2.5)中元素碳占比明显降低。从源解析结果上看,受管控措施影响,2016年燃煤、扬尘的贡献率明显降低。相对于管控解除期间,实施管控措施后,各污染源贡献的电离颗粒数均有明显降低。以上结果表明本次管控措施成效显著。

PM_(2.5) over Hangzhou City were measured by a single particle aerosol mass spectrometer( SPAMS) during an important event in 2016 and the corresponding period in 2015,the chemical characteristics and sources of PM_(2.5) were analyzed to evaluate the effects of pollution control measures on the air quality over Hangzhou. The results showed that compared to 2015,the proportion of particles with elemental carbon( EC) significantly decreased in 2016. As for the source apportionment results,benefiting from the control measures,contribution rates of coal combustion and dust dropped obviously in 2016.Analysis of samples from different controlling stages showed that compared with un-controlled period,ionized particles decreased dramatically after control. The above results indicated a great success of the control strategy for air pollution.