11. Creating and using trash art can expose people to hazardous substances . 12. That would be a violation of several hazardous substance laws. 13. There is a need to have an internationally recognized symbol when describing hazardous substances . 14. Sodium azide is a hazardous substance , highly explosive and tricky to handle in manufacturing. 15. Environmentally hazardous substances are not necessarily poisons, and vice versa. 16. Tests showed none contained any hazardous substance . ( cb / rw / pfg) 17. For example, illness that results after workplace exposure to hazardous substances requires medical evaluation. 18. Tight environmental standards have forced farmers to limit their use of environmentally hazardous substances . 19. The agency focuses on minimizing human health risks associated with exposure to hazardous substances . 20. In that way, all hazardous substance would be removed from the North Sea, Auken added.
