The Montreal Protocol on Substances that Deplete the Ozone Layer is an international treaty designed to protect the ozone layer by phasing out the production and consumption of ozone-depleting substances.

The main goal of the Montreal Protocol is to eliminate the production and consumption of substances that deplete the ozone layer, such as chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs).

Chlorofluorocarbons (CFCs) are the primary group of chemicals that have been identified as the main cause of ozone depletion.

CFCs rise into the stratosphere, where they react with ultraviolet radiation to produce chlorine atoms. These chlorine atoms then react with ozone molecules, breaking them down and leading to ozone depletion.

The Kigali Amendment to the Montreal Protocol, adopted in 2016, accelerated the phase-out of hydrochlorofluorocarbons (HCFCs) due to their ozone-depleting potential.

The Montreal Protocol aims to completely phase out the production and consumption of HCFCs by 2030.

The United Nations Environment Programme (UNEP) is the lead agency responsible for coordinating international efforts to implement the Montreal Protocol.

The Montreal Protocol's Multilateral Fund provides financial and technical assistance to developing countries to help them comply with the Protocol's requirements.

Canada was the first country to ratify the Montreal Protocol in 1988.

As of 2023, 198 countries have ratified the Montreal Protocol.

The Ozone Secretariat is the body responsible for overseeing the implementation of the Montreal Protocol.

The Kigali Amendment to the Montreal Protocol, adopted in 2016, introduced a global phase-out schedule for hydrofluorocarbons (HFCs).

The Montreal Protocol aims to completely phase out the production and consumption of HFCs by 2045.

The United Nations Environment Programme (UNEP) is responsible for monitoring the implementation of the Montreal Protocol.

The primary goal of the Vienna Convention for the Protection of the Ozone Layer is to establish a global monitoring network for ozone.