A cloud of dust brought by dry winds from the Sahara has settled over much of West and Central Africa, reducing visibility, choking residents, and disrupting fishing in the Senegal's capital Dakar. Each year, dry, dusty winds sweep in from the Sahara and cover much of West Africa and the Gulf of Guinea. The yearly phenomenon, known as the Harmattan season, runs from November through March. "Those who have toddlers with poor health like mine, who is not yet one year old, cannot work properly," said Khoudia Ndiaye, who sells fish at a market in Dakar. "Yesterday I couldn't work…