Volatile Organic Compound Composition of Urban Air in Nairobi, Kenya and Lagos, Nigeria
Volatile Organic Compound Composition of Urban Air in Nairobi, Kenya and Lagos, Nigeria
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DOI：
10.3390/atmos12101329
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发表时间：
2021-10
期刊：
影响因子：
2.9
通讯作者：
R. Cordell;Rikesh Panchal;E. Bernard;M. Gatari;Ezekiel Waiguru;Moses Ng’ang’a;J. Nyang’aya;M. Ogot;Michael J Wilde;K. Wyche;A. Abayomi;R. Alani;P. Monks;J. V. Vande Hey
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文献类型：
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作者：
R. Cordell;Rikesh Panchal;E. Bernard;M. Gatari;Ezekiel Waiguru;Moses Ng’ang’a;J. Nyang’aya;M. Ogot;Michael J Wilde;K. Wyche;A. Abayomi;R. Alani;P. Monks;J. V. Vande Hey
撒哈拉以南非洲地区正在经历快速的城市化，拉各斯和内罗毕等城市的人口以每年3-4%的速度增长。该地区对所有空气污染物的采样都非常不足，特别是挥发性有机化合物，挥发性有机化合物是来源分析的有用标志，本身也是有毒的。该区域的空气污染有许多因素，对细颗粒物污染的研究表明，交通是城市地区的主要污染源。在这项试点研究中，挥发性有机化合物进行了分析，在选择的路边和城市背景的位置在内罗毕和拉各斯，74挥发性有机化合物进行了量化。GC×GC-MS/FID分析显示，所有位置都以典型的车辆排放物碳氢化合物为主，其中芳烃苯和甲苯是最丰富的VOCs。城市居民的典型个人暴露情景计算结果远远超过欧洲/美国城市居民的暴露情景。最后，计算出的臭氧形成潜力的挥发性有机化合物测量被发现是类似的高其他大城市研究类似的空气污染问题。因此，进一步的研究对于确定该区域挥发性有机化合物污染的全面程度及其对对流层化学的影响至关重要。
Sub-Saharan Africa is seeing rapid urbanization, with the population of cities such as Lagos and Nairobi growing at a rate of 3–4% a year. The region is extremely under-sampled for all air pollutants, particularly VOCs, which are useful markers for source apportionment as well as toxic in their own right. There are many contributors to air pollution in the region, and studies examining fine particulate pollution implicate traffic as the primary source in urban areas. In this pilot study, VOCs were analysed at a selection of roadside and urban background locations in Nairobi and Lagos, and 74 VOCs were quantified. GC×GC–MS/FID analysis revealed all locations were dominated by hydrocarbons typical of vehicle emissions, with the aromatic hydrocarbons benzene and toluene among the most abundant VOCs. Typical personal exposure scenarios for citizens of the cities were calculated to far exceed those of a resident in a city in Europe/US. Finally, the calculated ozone forming potential of the VOCs measured was found to be similarly high to other large cities studied with similar air pollution problems. Further study is therefore essential to determine the full extent of VOC pollution in the region and its impact on tropospheric chemistry.