Department of Physics

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Levels of Aerosol in Dar Es Salaam, Tanzania, Compared to Some Cities
(2003) Koleleni, Yusuf I. A.
The aerosol concentrations in the city of Dar es Salaam were found with aim of investigating pollution levels. The aerosol samples were collected on the sites of Tanzania Oxygen Limited (TOL) which is purely an industrial area, Ocean Road Cancer Research Institute (ORCRI) located along the sea shore at the port exit, and Dar es Salaam International Airport (DIA) far from the city center. The PM10 dichotomous impactor was used for sample collection. The analysis of the samples was conducted with x-ray fluorescence spectrometer. The values obtained for Dar es Salaam aerosol samples are compared to similar samples of aerosol data available for the cities of Kinshasa and Butare in the republic of Congo and Rwanda respectively. The elements found in the aerosol samples include Si, P, S, Cl, K, Ca, Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, Ga, Br, Rb, Sr, Zr, Pb and Se. The variations of the minimum and maximum values of the elemental concentration in the sample for these elements are given for the months between September 1996 and May 1997. The elemental variation was affected by seasonal weather parameters like rain, wind speed and their directions. Temperatures varied between 29 and 32°C; rainfall between 5 and 70 mm while wind speed varied between 5 and 20 m/s.