Ozone-depleting substance of CFCs and their phase-out dates

The 1987 Montreal Protocol was signed by 23 nations including the United States. It called for a phased reduction in the production of CFCs leading to a complete phase-out by the Year 2000.
At a meeting of the Parties to the Montreal Protocol in Copenhagen in 1992, the phase-out date was accelerated to December 31, 1995. Signatories were almost 100 countries.
In 1992 and 1993, the EPA issued strict regulations controlling the use and handling of CFCs including penalties and fines of up to $25,000 per day per violation. Included were strict limits on leakage amounts, service practices, certification of technicians and equipment, record keeping, etc.
Under section 602 of the Clean Air Act, EPA was required to list in the Federal Register the GWPs for ozone-depleting substances. On January 19, 1996, EPA enacted refrigerant regulations to protect ozone layer and listed the Ozone-depleting substance of CFCs (table 1) and their phase-out dates. (9)

* Blanks in the data indicate that the information was not shown in the original source

Chlorofluorocarbons (CFCs) are nontoxic, nonflammable chemicals containing atoms of carbon, chlorine, and fluorine. They are used in the manufacture of aerosol sprays, blowing agents for foams and packing materials, as solvents, and as refrigerants. CFCs are classified as halocarbons, a class of compounds that contain atoms of carbon and halogen atoms. The ODPs (Ozone Depletion Potential, a number that refers to the amount of ozone depletion caused by a substance. The ODP is the ratio of the impact on ozone of a chemical compared to the impact of a similar mass of CFC-11. The ODP of CFC-11 is defined to be 1.0.) of CFCs range from 0.01 to 1.0. CFCs are also known to be greenhouse gases that may contribute to global warming, and increases in atmospheric CFC levels may exacerbate this environmental impact. The GWPs (Global Warming Potentials, used to compare the abilities of different greenhouse gases to trap heat in the atmosphere. GWPs are based on the radioactive efficiency of each gas relative to that of CO2, as well as the decay rate of each gas relative to that of CO2. The GWP of CO2 is defined to be 1.0.The GWP provides a construct for converting emissions of various gases into a common measure, which allows climate analysts to aggregate the radioactive impacts of various greenhouse gases into a uniform measure denominated in carbon or carbon dioxide equivalents) of CFCs (CFC-11, 12,13,113,114,115) range from 4000 to 11700, the GWPs of other CFCs are unknown. CFCs' phase-out dates are shown below. (Figure 2)

Figure 2: CFC refrigerant phase-out dates (10)