11.   Sodium azide is a hazardous substance, highly explosive and tricky to handle in manufacturing.

12.   The bogus test results render useless data the Army and Air Force need to identify hazardous substances for cleanup at Superfund sites.

13.   Whether lead exposure does or does not make drug addiction more likely, lead remains a hazardous substance.

14.   A United Nations team that visited the site last month found that mercury, asbestos and other hazardous substances had spilled into the environment there.

15.   He faces up to five years in prison for importing a hazardous substance.

16.   In March, the EPA proposed that coal ash be treated as a hazardous substance because of evidence that the waste may be more hazardous than previously thought.

17.   In June, nine countries with coasts along the North Sea will meet in Denmark to discuss ways of reducing discharges of hazardous substances into the sea.

18.   In that way, all hazardous substance would be removed from the North Sea, Auken added.

19.   In that way, all hazardous substances would be removed from the North Sea, Auken added.

20.   Lebanon had said the waste was illegally shipped to the country, and the international environmental group Greenpeace charges the wastes contained hazardous substances.