11.   It settles in the soil from chipped house paints, leaded gasoline, and around industrial areas that use lead.

12.   Lead in the environment is ubiquitous, but levels have dropped significantly since leaded gasoline and lead in paint were outlawed.

13.   Like many chronic toluene users, Seladore, Linda, Jimmy and Odell started sniffing substances like airplane glue and leaded gasoline when they were in their early teens.

14.   Mindful of the health problems caused by leaded gasoline, the EPA battled Ethyl for years, trying to keep MMT out of unleaded gasoline.

15.   Petroleum products such as kerosene, diesel fuel and leaded gasoline were employed for fuel and heating and used to dampen down sand and dust.

16.   Rather, they were exposed to what were normal amounts of lead in urban areas before leaded gasoline was banned.

17.   Rather, they had picked up lead from sources in the environment, including lead-soldered food cans and water pipes, and fumes from leaded gasoline.

18.   Some probably came from old house paint or leaded gasoline, they say.

19.   Sulfur clogs the devices much the same way leaded gasoline disables catalytic converters in cars.

20.   The choking air pollution from leaded gasoline fumes can be troubling for people with respiratory problems, particularly in the big cities such as Tehran and Isfahan.