Aldehydes in Relation to Air Pollution Sources: A Case Study around the Beijing Olympics.
Aldehydes in Relation to Air Pollution Sources: A Case Study around the Beijing Olympics.
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与空气污染来源有关的醛：围绕北京奥运会的案例研究。
DOI：
10.1016/j.atmosenv.2015.02.056
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发表时间：
2015-05-01
影响因子：
5
通讯作者：
Zhang, Junfeng
中科院分区：
文献类型：
--
作者：
Altemose, Brent;Gong, Jicheng;Zhu, Tong;Hu, Min;Zhang, Liwen;Cheng, Hong;Zhang, Lin;Tong, Jian;Kipen, Howard M.;Ohman-Strickland, Pamela;Meng, Qingyu;Robson, Mark G.;Zhang, Junfeng
本研究于2008年夏季和初秋（6月至10月）在北京市中心的一个地点对三种与健康有关的醛（甲醛、乙醛和丙烯醛）进行了表征。污染大气中的醛类化合物既有一次源，也有二次源，这限制了对这些活性化合物的控制策略。在北京奥运会之前、期间和之后进行了测量，以检查奥运会期间实施的大规模空气污染控制措施是否对三种醛的浓度及其潜在的一次和二次来源产生了影响。在整个测量期间，甲醛、乙醛和丙烯醛的平均浓度分别为29.3±15.1 μg/m3、27.1±15.7 μg/m3和2.3±1.0 μg/m3，均处于光化学雾霾季节全球城市测量浓度范围的高端。在污染控制期间，甲醛和丙烯醛较奥运会前有所增加，遵循温度变化规律，与臭氧和主成分分析（PCA）鉴定的次级形成因子显著相关。相比之下，在奥运会空气污染控制期间，乙醛的平均浓度比奥运会前有所下降，并与当地排放源排放的几种污染物（如NO2、CO和PM2.5）显著相关。乙醛也与主要排放源密切相关，包括通过PCA确定的植物燃烧和油燃烧因素。在奥运会后采样期间，这三种醛的含量都低于奥运会前和奥运会期间，这可能是由于季节和区域影响。我们的发现指出了二次污染物源控制策略的复杂性。
This study was carried out to characterize three aldehydes of health concern (formaldehyde, acetaldehyde, and acrolein) at a central Beijing site in the summer and early fall of 2008 (from June to October). Aldehydes in polluted atmospheres come from both primary and secondary sources, which limits the control strategies for these reactive compounds. Measurements were made before, during, and after the Beijing Olympics to examine whether the dramatic air pollution control measures implemented during the Olympics had an impact on concentrations of the three aldehydes and their underlying primary and secondary sources. Average concentrations of formaldehyde, acetaldehyde and acrolein were 29.3±15.1 μg/m3, 27.1±15.7 μg/m3 and 2.3±1.0 μg/m3, respectively, for the entire period of measurements, all being at the high end of concentration ranges measured in cities around the world in photochemical smog seasons. Formaldehyde and acrolein increased during the pollution control period compared to the pre-Olympic Games, followed the changing pattern of temperature, and were significantly correlated with ozone and with a secondary formation factor identified by principal component analysis (PCA). In contrast, acetaldehyde had a reduction in mean concentration during the Olympic air pollution control period compared to the pre-Olympic period and was significantly correlated with several pollutants emitted from local emission sources (e.g., NO2, CO, and PM2.5). Acetaldehyde was also more strongly associated with primary emission sources including vegetative burning and oil combustion factors identified through the PCA. All three aldehydes were lower during the post-Olympic sampling period compared to the before and during Olympic periods, likely due to seasonal and regional effects. Our findings point to the complexity of source control strategies for secondary pollutants.
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