From Daily Mail (tabloid):
A massive plume of hazardous dust is heading towards the US East Coast, and millions have been warned to prepare for air quality alerts and breathing issues.
Saharan dust is exactly what it sounds like – a cloud of sand and dirt blown west across the Atlantic Ocean by strong wind currents passing over Africa. The winds take the contents of the Sahara Desert into the atmosphere, where they travel towards Florida, the US Gulf Coast and the Caribbean, bringing days of hazy skies, lower rain chances and air quality concerns for those with preexisting health problems. A 3,000-mile-long plume of Saharan dust has been spotted by meteorologists in the Southeast, and the latest forecasts expect the dust to arrive in South Florida by Monday.