11.   Lead levels are high in Egyptian air, with most of the pollution blamed on vehicle exhaust.

12.   Lead from vehicle exhausts and industry can damage the mental development of children.

13.   Soot particles can be generated by industry, power plants and vehicle exhaust.

14.   Toyota Motor Corp. said Wednesday it will soon introduce a new engine that sharply reduces the amount of pollutants in vehicle exhaust.

15.   Vehicle exhausts are sources for the odorless and tasteless gas.

16.   An investigation by the municipal environmental science academy showed vehicle exhaust had become the major contributor to air pollution in Shanghai.

17.   The fine particles come from such sources as industrial combustion and vehicle exhaust.