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Montrial protocol is

The Montreal Protocol is the first worldwide agreement designed to protect human health and the environment against the adverse effects of the depletion of the stratospheric ozone layer. The protocol is administered by the United Nations Environment Programme (UNEP), which maintains the list of ozone-depleting substances that are targeted for control practices, reductions, or total phase-outs.

A chemical's Ozone Depleting Potential (ODP) formed the primary basis for inclusion on the list, although the final list was a product of international negotiation. ODP is defined as the ratio of calculated ozone column change for each mass unit of a gas emitted into the atmosphere relative to the calculated depletion for the reference gas CFC-11 (ODP = 1.0).

The Montreal Protocol includes a unique adjustment provision that enables the parties to the protocol to respond quickly to new scientific information and agree to accelerate the reductions required on chemicals already covered by the Protocol. These adjustments are then automatically applicable to all countries that ratified the Protocol. Since its initial adoption,it has been adjusted five times.