The Montreal Protocol was designed to eliminate substances that deplete ozone by reaction with ozone (O3) in the stratosphere
- Chlorofluorocarbons (CFCs) and Halons
- Hydrochlorofluorocarbons (HCFCs) e.g. R22
- Hydrobromofluorocarbons (HBFCs)
- Carbon tetrachloride
- Methyl chloroform (1,1,1-trichloroethane)
- Methyl bromide
The Montreal Protocol works by increasingly limiting supply rather than an outright ban. The use of listed substances as solvents or reagents should be avoided.