The World Health Organisation compiled the following list of toxic and hazardous substances requiring priority consideration:
- Arsenic and compounds
- Acids or bases used to finish metals
- Antimony & compounds
- Asbestos
- Azides
- Beryllium & compounds
- Biocides ,
- Cadmium & compounds
- Chemical Laboratory materials
- Chlorinated solvents
- Chromium (VI) compounds
- Cyanide compounds
- Ethers
- Isocyanates
- Lead & compounds
- Metal carbonyls
- Mercury & compounds
- Organic solvents
- Organohalagenated compounds (not polymers)
- Pharmaceuticals
- Polycyclic aromatic hydrocarbons
- PCBs
- Peroxides, chlorates, perchlorates
- Phenolic compounds
- Selenium & compounds
- Soluble copper compounds
- Tarry materials from refining
- Tellurium & compounds
- Thallium & compounds
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