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Sokoto (13.01 0 N, 5.15 0 E) lies within the hot /dry semi desert climate type i.e. Sahel Savannah climate zone and is identified as one of the regions in West Africa that is severely affected by the dust particles originating from Sahara desert. In this paper, we computed the residence time of dust aerosol in Sokoto region using visibility data for 20 years (1991-2010) obtained from Nigeria Meteorological Agency (NIMET). The method used yielded results which show variations in the values of the monthly and annual mean residence time of values 2.4-12.9 and 5.21 days respectively for the Harmattan months (November to March). These values are in general agreed with measurable values and similar to other naturally occurring aerosols in the atmosphere. Reasons are adduced for the variations.

Evaluation of Residence Time of Dust Aerosols during the Harmattan Season in Sokoto Area of Northwestern Nigeria, Using Visibility Data