The full and sustainable implementation of the Montreal Protocol aims to restore the ozone layer by the middle of the century. Without this treaty, the depletion of the ozone layer would have increased tenfold by 2050 compared to current levels and would have resulted in millions more cases of melanoma, other cancers and eye cacti. It was estimated, for example, that the Montreal Protocol would save two million people from skin cancer each year by 2030. In the 1970s and 1980s, there was growing international concern that SO was harming the ozone layer. In 1985, international cooperation in this area was formalized by the Vienna Convention on the Protection of the Ozone Layer. This cooperation led to the signing in 1987 of the Montreal Protocol on ozone-depleting substances. Parties to the Montreal Protocol have advisory bodies called Assessment Panels.Exit Assessment bodies are responsible for reporting regularly on progress in implementing the reduction of ozone-depleting substances, including the assessment of alternatives and emission reductions. The Montreal Protocol is also expected to have an impact on human health. A U.S. report.
S. Environmental Protection Agency 2015 estimates that protecting the ozone layer under the treaty will prevent more than 280 million cases of skin cancer, 1.5 million skin cancer deaths and 45 million cataracts in the United States.  Since the Montreal Protocol came into force, atmospheric concentrations of major chlorofluorocarbons and associated chlorinated hydrocarbons have flattened or decreased.  Halon concentrations have continued to increase due to the release of halons currently stored in fire extinguishers, but their rate of increase has slowed and their frequency is expected to decrease by about 2020. The concentration of HCFCs has also increased drastically, at least in part, as many uses (for example. B as a solvent or refrigerant) replaced HCFCs with HCFCs. Although there have been reports of attempts by individuals to circumvent the ban. B, for example by smuggling undeveloped CFCs to industrialized countries, the overall level of compliance was high.
The 2010 statistical analysis shows a clear positive signal from the Montreal Protocol to stratospheric ozone.  As a result, the Montreal Protocol has often been described as the most successful international environmental agreement to date. In a 2001 report, NASA found that ozone dilution over Antarctica had remained the same thickness over the past three years, but in 2003, the hole in the ozone layer grew to its second largest size.  In the latest scientific assessment of the impact of the Montreal Protocol (2006), it states: “The Montreal Protocol works: there are clear signs of reduced atmospheric exposure to ozone-depleting substances and some early signs of stratospheric ozone recovery.”  However, a recent study suggests a relative increase in CFCs due to an unknown source.  Chlorofluorocarbons, commonly known as HCFCs, are a group of human compounds that contain hydrogen, chlorine, fluorine and carbon. They are not found anywhere in nature. Production of HCFCs began after countries agreed in the 1980s to end the use of CFCs that destroyed the ozone layer. Like CFCs, HCFCs are used for cold, aerosol fuels, foam production and air conditioning. However, unlike CFCs, most HCFCs are degraded in the lowest part of the atmosphere and pose a much lower risk to the ozone layer.