Abstract
Atmospheric measurements were made throughout 1976 at a rural site in the nigerian savanna. Concentrations of trace and major elements in air were an order of magnitude higher in the dry season, when air is of Saharan origin, than in the rainy season when maritime tropical air dominates. The annual average concentrations of elements originating from soil dust, Al, Ce, Mg, Sc and Ti were more than an order of magnitude higher compared with southern England, whereas levels of heavy metals were generally lower. The enrichment factors (ratio of elements to Sc in the air relative to ratios of the same elements in average soil) found in northern Nigeria for As, Br, Cl, Pb, Sb and Zn were two orders of magnitude below those in rural England: this is attributed to less industrial development at equatorial relative to northerly latitudes. Enrichment factors in Nigeria are also compared with data from south Africa and urban regions in England.
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