A massive dust plume came from the Sahara Desert in Northern Africa and is making its way across the Caribbean.
Summer dust plumes are common, but experts say one with this size and concentration hasn't been seen in 50 years.
It's so large its been nicknamed the "Godzilla Dust Cloud."
Air quality across most of the region fell to record hazardous levels, and experts have now warned people in the Caribbean to stay indoors and use air filters if they have them.
The dust is forecasted to move across the Gulf of Mexico toward Texas and may reach the U.S. by Thursday morning.