Large plumes of Saharan dust can travel over 4,000 miles across the Atlantic Ocean causing a thick haze in South Florida during late June to mid-August. The particle size of long-range transported to South Florida mineral dust typically does not exceed 20 to 30 m. Wind velocities of up to 25 m/s associated with the Atlantic extension of the African easterly jet can lead to fast westward transport, particularly around 4 km elevation. Assuming the following conditions apply: Average size of the dust particle: 10 m Density of Saharan dust: 2600 kg/m3 Particle elevation leaving Saharan desert: 1 km Air temperature = 20 C Density of air: 1.293 kg/m3 Viscosity of air = 1.81x10-5 N s/m2 =1.81x10-5 kg/m-s What is the fall time of these particles from 1 km? (days))