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there'll be less tropical activity for several weeks,until the plume disappears.However,not all the dust stays high up in the atmosphere;some falls closer to the Earth's surface,damaging air quality,reducing visibility,and making respiratory diseases worse. An interesting fact about these Saharan dust plumes is that they enrich the Atlantic Ocean with nutrition,delivering phos- phorous (and iron to areas of the ocean.This allows cya- nobacteria,an ancient form of plants in the sea,to grow.Not all bacterial growth is good,however.According to scientist Mat- thew Cappucci,the Saharan dust can cause a species of bacteria called vibrio to reproduce.