The Sahara dust, also called the Saharan Air Layer (SAL), forms over the Saharan desert every spring, extending one to three ...

If it's high enough, air quality alerts may be issued this week. "The Saharan Air Layer is a mass of very dry, dusty air that forms over the Sahara Desert during the late spring, summer ...

For example, it is common to find a strong jet of wind at about 600 mb blowing along the edge of the Saharan Air Layer (SAL)--that area of dry, dusty air that frequently lies to the north of ...