The Harmattan is a dry and dusty wind blowing northeast and west of the Sahara into the Gulf of Guinea between November and March (winter) each year. It is considered a Natural Hazard. On its passage over the desert it picks up fine dust particles The dust in the air can severely limit visibility and block the sun for several days it is comparable to a heavy fog, this effect yearly cause airlines millions due to cancelling and diverting of flights.
Cars are covered in a layer of dust as are the hallways in the MTC due to open windows with screens. It is difficult to keep anything clean and if history repeats itself will last at least 2 months.
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