Acidification problems in developing countries are expected to become more prevalent in the coming decades. Assessments of means of abatement strategies are likely to become of vital interest. This paper presents some preliminary results of modelling of acidic deposition due to anthropogenic emissions of sulfur in Africa and South America, using emission data for 1987. The calculations indicate that the anthropogenic perturbation of the sulfur deposition exceeds 100 mg S m-2yr-1 for southern Africa, areas around the Red Sea, Caribbean Islands, northernmost South America, central Andes, and the eastern parts of Brazil and Argentina. Substantial areas around the major source regions receive more than 250 mg S m-2yr-1. Even higher values are calculated for areas surrounding large cities as Carracas, Lima, Rio de Janeiro and Sao Paulo, Pretoria and around the borderline between Zaire and Zambia.