REGULATIONS|Environmental Hazard Lists

List: Ozone Depleting Substances List (Montreal Protocol)
Description
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 divides ozone depleting substances into a variety of lists of chemicals that are subject to different control requirements. Countries that sign the treaty commit to
1) stop consumption or production of chemicals on Group 1 of Annex A after January 1, 1996 (CFC 11, CFC 12, CFC 113, CFC 114, and CFC 115).
2) stop consumption or production of chemicals on Group 2 of Annex A after January 1, 1994 (Halon 1211, Halon 1301, and Halon 2402.)
3) stop consumption or production of chemicals on Groups 1, 2 and 3 of Annex B after January 1, 1996 (CFC 13, CFC 111, CFC 112, CFC 211, CFC 212, CFC 213, CFC 214, CFC 215, CFC 216, CFC 217, carbon tetrachloride, and 1,1,1-trichloroethane)
4) reduce consumption or production of hydrochlorofluorocarbons listed in Group 1 of Annex C to 1989 levels
5) reduce consumption or production of methyl bromide to 75% of 1991 levels beginning in 1999.

EPA has issued regulations issued under sections 601-607 of the Clean Air Act to implement the Montreal Protocol and phase out the production of several ozone-depleting substances. EPA utilizes a different classification system for identifying chemicals for regulatory controls, dividing the universe of substances covered by the Montreal Protocol into Class I and Class II ozone depleting substances.
More on EPA regulations for phasing out Class I ozone depleting substances.
More on EPA's regulations for controlling all ozone depleting substances.

Note that while the Montreal Protocol mandates an end to the production and consumption of the major CFCs, halons, hydrobromofluorocarbons and methyl bromide by 1996, there continue to be substantial releases of some of these substances in the U.S. (based on industry reports to TRI). Implementation of the Montreal Protocol is dependent on national regulation, and in the U.S. the EPA has focused on eliminating production of Class I ozone depleting substances by the treaty's phase-out dates. Use of previously produced stocks of ozone depleting substances was not banned as of January 1, 1996, and releases to the atmosphere continue. Facilities reporting releases of Class I ozone depleting substances may have been legally using previously produced stocks or operating under essential use exemptions, or they may have been operating illegally. EPA is currently actively enforcing the CAA restrictions on uses of ozone depleting chemicals.

Reference
gas CFC-11 (ODP = 1.0).

The Montreal Protocol divides ozone depleting substances into a variety of lists of chemicals that are subject to different control requirements. Countries that sign the treaty commit to
1) stop consumption or production of chemicals on Group 1 of Annex A after January 1, 1996 (CFC 11, CFC 12, CFC 113, CFC 114, and CFC 115).
2) stop consumption or production of chemicals on Group 2 of Annex A after January 1, 1994 (Halon 1211, Halon 1301, and Halon 2402.)
3) stop consumption or production of chemicals on Groups 1, 2 and 3 of Annex B after January 1, 1996 (CFC 13, CFC 111, CFC 112, CFC 211, CFC 212, CFC 213, CFC 214, CFC 215, CFC 216, CFC 217, carbon tetrachloride, and 1,1,1-trichloroethane)
4) reduce consumption or production of hydrochlorofluorocarbons listed in Group 1 of Annex C to 1989 levels
5) reduce consumption or production of methyl bromide to 75% of 1991 levels beginning in 1999.

EPA has issued regulations issued under sections 601-607 of the Clean Air Act to implement the Montreal Protocol and phase out the production of several ozone-depleting substances. EPA utilizes a different classification system for identifying chemicals for regulatory controls, dividing the universe of substances covered by the Montreal Protocol into Class I and Class II ozone depleting substances.
More on EPA regulations for phasing out Class I ozone depleting substances.
More on EPA's regulations for controlling all ozone depleting substances.

Note that while the Montreal Protocol mandates an end to the production and consumption of the major CFCs, halons, hydrobromofluorocarbons and methyl bromide by 1996, there continue to be substantial releases of some of these substances in the U.S. (based on industry reports to TRI). Implementation of the Montreal Protocol is dependent on national regulation, and in the U.S. the EPA has focused on eliminating production of Class I ozone depleting substances by the treaty's phase-out dates. Use of previously produced stocks of ozone depleting substances was not banned as of January 1, 1996, and releases to the atmosphere continue. Facilities reporting releases of Class I ozone depleting substances may have been legally using previously produced stocks or operating under essential use exemptions, or they may have been operating illegally. EPA is currently actively enforcing the CAA restrictions on uses of ozone depleting chemicals.

REFERENCE
United Nations Environment Programme. Montreal Protocol on Substances that Deplete the Ozone Layer. UNEP. 1987. Last amended September, 1997.
http://www.unep.ch/ozone/mont_t.htm

U.S. EPA
List of Class I Ozone Depleting Substances (with ODP and GWP)
http://www.epa.gov/ozone/ods.html
List of Class II Ozone Depleting Substances (with ODP and GWP)
http://www.epa.gov/ozone/ods2.html

 
List of Chemicals
Note: For your convenience, these data are also available as a CSV file. Click here to download.

Chemical Name CAS Registry Number (or EDF Substance ID)
BROMOCHLORODIFLUOROMETHANE353-59-3
BROMODIFLUOROETHANE (3 ISOMERS)EDF-250
BROMODIFLUOROMETHANE1511-62-2
BROMODIFLUOROPROPANE (9 ISOMERS)EDF-238
BROMOFLUOROETHANE (2 ISOMERS)EDF-261
BROMOFLUOROMETHANE373-52-4
BROMOFLUOROPROPANE (5 ISOMERS)EDF-236
BROMOHEXAFLUOROPROPANE (5 ISOMERS)EDF-245
BROMOPENTAFLUOROPROPANE (8 ISOMERS)EDF-231
BROMOTETRAFLUOROETHANE (2 ISOMERS)EDF-255
BROMOTETRAFLUOROPROPANE (12 ISOMERS)EDF-243
BROMOTRIFLUOROETHANE (3 ISOMERS)EDF-248
BROMOTRIFLUOROMETHANE75-63-8
BROMOTRIFLUOROPROPANE (12 ISOMERS)EDF-240
CARBON TETRACHLORIDE56-23-5
2-CHLORO-1,1,1,2-TETRAFLUOROETHANE2837-89-0
2-CHLORO-1,1,1-TRIFLUOROETHANE75-88-7
3-CHLORO-1,1,1-TRIFLUOROPROPANE460-35-5
1-CHLORO-1,1,2,2-TETRAFLUOROETHANE354-25-6
1-CHLORO-1,1-DIFLUOROETHANE75-68-3
2-CHLORO-1,3-DIFLUOROPROPANE102738-79-4
1-CHLORO-2,2,3,3-TETRAFLUOROPROPANE679-85-6
1-CHLORO-2-FLUOROETHANE762-50-5
2-CHLORO-2-FLUOROPROPANE420-44-0
CHLORODIFLUOROETHANEEDF-265
CHLORODIFLUOROMETHANE75-45-6
CHLORODIFLUOROPROPANEEDF-284
CHLOROFLUOROETHANEEDF-092
CHLOROFLUOROMETHANE593-70-4
CHLOROFLUOROPROPANEEDF-285
CHLOROHEPTAFLUOROPROPANE422-86-6
CHLOROHEXAFLUOROPROPANEEDF-270
CHLOROPENTAFLUOROPROPANEEDF-275
CHLOROTETRAFLUOROETHANE63938-10-3
CHLOROTETRAFLUOROPROPANEEDF-279
CHLOROTRIFLUOROMETHANE75-72-9
CHLOROTRIFLUOROPROPANEEDF-282
DIBROMODIFLUOROETHANE (4 ISOMERS)EDF-247
DIBROMODIFLUOROPROPANE (16 ISOMERS)EDF-241
DIBROMOFLUOROETHANE (3 ISOMERS)EDF-251
DIBROMOFLUOROMETHANE1868-53-7
DIBROMOFLUOROPROPANE (9 ISOMERS)EDF-237
DIBROMOPENTAFLUOROPROPANE (9 ISOMERS)EDF-232
DIBROMOTETRAFLUOROETHANE [HALON 2402]124-73-2
DIBROMOTETRAFLUOROPROPANE (16 ISOMERS)EDF-259
DIBROMOTRIFLUOROETHANE (3 ISOMERS)EDF-246
DIBROMOTRIFLUOROPROPANE (18 ISOMERS)EDF-244
3,3-DICHLORO-1,1,1,2,2-PENTAFLUOROPROPANE422-56-0
2,3-DICHLORO-1,1,1,2,3-PENTAFLUOROPROPANE(HCFC-225BA)422-48-0
2,2-DICHLORO-1,1,1,3,3-PENTAFLUOROPROPANE(HCFC-225AA)128903-21-9
3,3-DICHLORO-1,1,1-TRIFLUOROPROPANE460-69-5
2,3-DICHLORO-1,1,1-TRIFLUOROPROPANE338-75-0
1,3-DICHLORO-1,1,2,2,3-PENTAFLUOROPROPANE507-55-1
1,2-DICHLORO-1,1,2,3,3-PENTAFLUOROPROPANE(HCFC-225BB)422-44-6
1,3-DICHLORO-1,1,2,3,3-PENTAFLUOROPROPANE(HCFC-225EA)136013-79-1
1,2-DICHLORO-1,1,2-TRIFLUOROETHANE354-23-4
1,2-DICHLORO-1,1,3,3,3-PENTAFLUOROPROPANE(HCFC-225DA)431-86-7
1,2-DICHLORO-1,1-DIFLUOROETHANE1649-08-7
1,1-DICHLORO-1,2,2,3,3-PENTAFLUOROPROPANE(HCFC-225CC)13474-88-9
1,1-DICHLORO-1,2,2-TRIFLUOROETHANE812-04-4
1,1-DICHLORO-1,2,2-TRIFLUOROPROPANE7125-99-7
1,1-DICHLORO-1,2,3,3,3-PENTAFLUOROPROPANE(HCFC-225EB)111512-56-2
1,1-DICHLORO-1-FLUOROETHANE1717-00-6
1,1-DICHLORO-1-FLUOROPROPANE7799-56-6
DICHLORODIFLUOROETHANE25915-78-0
DICHLORODIFLUOROMETHANE75-71-8
DICHLORODIFLUOROPROPANEEDF-281
DICHLOROFLUOROETHANEEDF-264
1,2-DICHLOROFLUOROETHANE430-57-9
DICHLOROFLUOROMETHANE75-43-4
DICHLOROFLUOROPROPANEEDF-283
DICHLOROHEXAFLUOROPROPANE661-97-2
DICHLOROTETRAFLUOROETHANE (CFC-114)76-14-2
DICHLOROTETRAFLUOROPROPANEEDF-274
DICHLOROTRIFLUOROETHANE34077-87-7
DICHLOROTRIFLUOROPROPANEEDF-278
DICHLORPENTAFLUORO-PROPANE127564-92-5
FREON 11376-13-1
HCFC-122 (3 ISOMERS)EDF-262
HCFC-151A1615-75-4
HCFC-233 (3 ISOMERS)1330-45-6
HEPTACHLOROFLUOROPROPANE422-78-6
HEXABROMOFLUOROPROPANE (5 ISOMERS)EDF-260
HEXACHLORODIFLUOROPROPANE3182-26-1
HEXACHLOROFLUOROPROPANEEDF-266
METHYL BROMIDE74-83-9
MONOCHLOROPENTAFLUOROETHANE76-15-3
PENTABROMODIFLUOROPROPANE (9 ISOMERS)EDF-235
PENTABROMOFLUOROPROPANE (9 ISOMERS)EDF-254
PENTACHLORODIFLUOROPROPANEEDF-267
PENTACHLOROFLUOROETHANE354-56-3
PENTACHLOROFLUOROPROPANEEDF-271
PENTACHLOROTRIFLUOROPROPANE2354-06-5
TETRABROMODIFLUOROPROPANE (16 ISOMERS)EDF-257
TETRABROMOFLUOROETHANE (2 ISOMERS)EDF-256
TETRABROMOFLUOROPROPANE (12 ISOMERS)EDF-242
TETRABROMOTRIFLUOROPROPANE (12 ISOMERS)EDF-234
1,1,2,2-TETRACHLORO-1,2-DIFUOROETHANE (FC 112)76-12-0
1,1,2,2-TETRACHLORO-1-FLUOROETHANE354-14-3
1,1,1,2-TETRACHLORO-2-FLUOROETHANE (HCFC-121A)354-11-0
TETRACHLORODIFLUOROPROPANEEDF-272
TETRACHLOROFLUOROETHANEEDF-097
TETRACHLOROFLUOROPROPANEEDF-276
TETRACHLOROTETRAFLUOROPROPANE29255-31-0
TETRACHLOROTRIFLUOROPROPANEEDF-268
1,1,1,2-TETRAFLUORO-2,2-DICHLOROETHANE374-07-2
TRIBROMODIFLUOROETHANE (3 ISOMERS)EDF-253
TRIBROMODIFLUOROPROPANE (18 ISOMERS)EDF-252
TRIBROMOFLUOROETHANE (3 ISOMERS)EDF-249
TRIBROMOFLUOROPROPANE (12 ISOMERS)EDF-239
TRIBROMOTETRAFLUOROPROPANE (12 ISOMERS)EDF-233
TRIBROMOTRIFLUOROPROPANE (18 ISOMERS)EDF-258
1,1,3-TRICHLORO-1-FLUOROPROPANE818-99-5
1,1,1-TRICHLORO-3,3,3-TRIFLUOROPROPANE7125-83-9
1,1,2-TRICHLORODIFLUOROETHANE354-21-2
TRICHLORODIFLUOROPROPANEEDF-277
1,1,1-TRICHLOROETHANE71-55-6
1,1,2-TRICHLOROFLUOROETHANEEDF-090
TRICHLOROFLUOROETHANE27154-33-2
TRICHLOROFLUOROMETHANE75-69-4
TRICHLOROFLUOROPROPANEEDF-280
TRICHLOROPENTAFLUOROPROPANE1599-41-3
TRICHLOROTETRAFLUOROPROPANEEDF-269
TRICHLOROTRIFLUOROPROPANEEDF-273
1,1,1-TRIFLUORO-2,2-DICHLOROETHANE306-83-2

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