21.   The conventional explanation of lead in the atmosphere, for example, held that it came mainly from leaded gasoline.

22.   The leaders also agreed to phase out leaded gasoline from the hemisphere by the end of this decade.

23.   The station handled a lot of calls from drivers who worried about old cars that seemed to rely on leaded gasoline.

24.   There are sources besides paint, but since leaded gasoline has all but disappeared, the main source is lead paint.

25.   This was before the heyday of leaded gasoline, and corresponded with a rise in incinerator construction and use in the New York area.

26.   What helped, Fernandez said, was the phasing out of leaded gasoline use in Mexico.

27.   Production of leaded gasoline in China must stop by the end of next year, the government said in an order released on Friday.

28.   A study showing high levels of lead in the blood of young children on this Caribbean island has prompted the gasoline distributor to discontinue the sale of leaded gasoline.

29.   Because most of these vehicles have no emission controls and run on leaded gasoline, they are an increasingly large source of heavy air pollution in urban China.

30.   Beijing, one of the most polluted cities in the world, will ban the sale of leaded gasoline starting Thursday.