Transboundary Pollution in the Capital City of Botswana

This paper presents aerosol studies carried out in the capital city of Botswana. The use of backward air mass trajectories has shown that elevated concentrations of fine particles correspond to situations when the air mass originated in the Pretoria and Johannesburg region in South Africa. This illustrated transboundary pollution and also served as an example of long distance transport. The results also show a significant contribution of a local generated pollution. The data has been subjected to principal component analysis (PCA) in order to make source apportionment.