A massive cloud of Saharan dust has reached South Florida, bringing hazy skies and the potential for ‘dirty rain’ as it moves across the state. The Saharan Air Layer, originating from North Africa, is about 2,000 miles wide and 750 miles long, and is expected to spread into parts of Georgia, South Carolina, Texas, and the Gulf and southeast Atlantic Ocean by Friday. While this phenomenon can cause colorful sunsets, it can also degrade air quality and pose health risks, particularly for vulnerable populations, prompting the CDC to recommend limited outdoor activity during its presence.