开罗大气中铅的空间和季节变化

Esmat A. Ali, M.M. Nasralla, A.A. Shakour
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引用次数: 13

摘要

研究了开罗大气中铅浓度的空间和季节变化。结果表明,开罗市中心和人口密集地区的年平均铅浓度超过了2μm−3的建议限值。与欧洲城市的数据形成鲜明对比的是,夏季的铅浓度高于冬季。计算出的铅颗粒沉降速度表明,与城市其他地区大气中的铅颗粒相比,中心城区的铅颗粒可以长时间悬浮,因此可以吸入。
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Spatial and seasonal variation of lead in Cairo atmosphere

Spatial and seasonal variation of lead concentrations were investigated in the Cairo atmosphere. It was found that the annual mean lead concentrations in the central and densely populated parts of Cairo exceeded the 2μm−3 recommended limit. In sharp contrast to data for European cities, summer lead concentrations were higher than those detected during winter. Calculated settling velocities of lead particles show that in the central urban district lead particles can stay suspended for long periods, and so are available for inhalation, as compared with particles found in the atmosphere of other parts of the city.

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