In the United States it was not until 1973 that people started to produce gasoline without lead and, in 1996, the Clean Air Act banned the sale of leaded fuel for use in on-road vehicles. However it was still legal in the U.S. for aircraft, racing cars, farm equipment, and marine engines until 2008. Leaded gasoline is still common in South America, Africa, and some parts of Asia and the Middle East.