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The ODS are split into two groups under the Clean Air Act: Class I ODS, such as (CFCs), and Class II ODS, such as (HCFCs).
For each ODS, this page provides the compound’s atmospheric lifetime, O (ODP), (GWP), and Chemistry Abstract Service (CAS) registry numbers.
Information on acceptable ODS alternatives (e.g., hydrofluorocarbons) is available through EPA’s Significant New Alternatives Policy (SNAP) Program.
Class I ODS are divided into eight groups.
Chemical Name | Lifetime, in years | ODP1 (Montreal Protocol) | ODP2 (WMO 2011) | GWP1 (AR4) | GWP2 (AR5) | CAS Number |
---|---|---|---|---|---|---|
Group I | ||||||
CFC-11 (CCl3F) Trichlorofluoromethane | 45 | 1 | 1 | 4750 | 4660 | 75-69-4 |
CFC-12 (CCl2F2) Dichlorodifluoromethane | 100 | 1 | 0.82 | 10900 | 10200 | 75-71-8 |
CFC-113 (C2F3Cl3) 1,1,2-Trichlorotrifluoroethane | 85 | 0.8 | 0.85 | 6130 | 5820 | 76-13-1 |
CFC-114 (C2F4Cl2) Dichlorotetrafluoroethane | 190 | 1 | 0.58 | 10000 | 8590 | 76-14-2 |
CFC-115 (C2F5Cl) Monochloropentafluoroethane | 1020 | 0.6 | 0.5 | 7370 | 7670 | 76-15-3 |
Group II | ||||||
Halon 1211 (CF2ClBr) Bromochlorodifluoromethane | 16 | 3 | 7.9 | 1890 | 1750 | 353-59-3 |
Halon 1301 (CF3Br) Bromotrifluoromethane | 65 | 10 | 15.9 | 7140 | 6290 | 75-63-8 |
Halon 2402 (C2F4Br2) Dibromotetrafluoroethane | 20 | 6 | 13.0 | 1640 | 1470 | 124-73-2 |
Group III | ||||||
CFC-13 (CF3Cl) Chlorotrifluoromethane | 640 | 1 | 1 | 14420 | 13900 | 75-72-9 |
CFC-111 (C2FCl5) Pentachlorofluoroethane | 1 | 1 | 354-56-3 | |||
CFC-112 (C2F2Cl4) Tetrachlorodifluoroethane | 1 | 1 | 76-12-0 | |||
CFC-211 (C3FCl7) Heptachlorofluoropropane | 1 | 1 | 422-78-6 | |||
CFC-212 (C3F2Cl6) Hexachlorodifluoropropane | 1 | 1 | 3182-26-1 | |||
CFC-213 (C3F3Cl5) Pentachlorotrifluoropropane | 1 | 1 | 2354-06-5 | |||
CFC-214 (C3F4Cl4) Tetrachlorotetrafluoropropane | 1 | 1 | 29255-31-0 | |||
CFC-215 (C3F5Cl3) Trichloropentafluoropropane | 1 | 1 | 4259-43-2 | |||
CFC-216 (C3F6Cl2) Dichlorohexafluoropropane | 1 | 1 | 661-97-2 | |||
CFC-217 (C3F7Cl) Chloroheptafluoropropane | 1 | 1 | 422-86-6 | |||
Group IV | ||||||
CCl4 Carbon tetrachloride | 26 | 1.1 | 0.82 | 1400 | 1730 | 56-23-5 |
Group V | ||||||
Methyl Chloroform (C2H3Cl3) 1,1,1-trichloroethane | 5 | 0.1 | 0.16 | 146 | 160 | 71-55-6 |
Group VI | ||||||
Methyl Bromide (CH3Br) | 0.8 | 0.7 | 0.66 | 5 | 2 | 74-83-9 |
Group VII | ||||||
CHFBr2 | 1 | 1 | ||||
HBFC-12B1(CHF2Br) | 0.74 | |||||
CH2FBr | 0.73 | 0.73 | ||||
C2HFBr4 | 0.3-0.8 | 0.3-0.8 | ||||
C2HF2Br3 | 0.5-1.8 | 0.5-1.8 | ||||
C2HF3Br2 | 0.4–1.6 | 0.4–1.6 | ||||
C2HF4Br | 0.7–1.2 | 0.7–1.2 | ||||
C2H2FBr3 | 0.1–1.1 | 0.1–1.1 | ||||
C2H2F2Br2 | 0.2–1.5 | 0.2–1.5 | ||||
C2H2F3Br | 0.7–1.6 | 0.7–1.6 | ||||
C2H3FBr2 | 0.1–1.7 | 0.1–1.7 | ||||
C2H3F2Br | 0.2–1.1 | 0.2–1.1 | ||||
C2H4FBr | 0.07–0.1 | 0.07–0.1 | ||||
C3HFBr6 | 0.3–1.5 | 0.3–1.5 | ||||
C3HF2Br5 | 0.2–1.9 | 0.2–1.9 | ||||
C3HF3Br4 | 0.3–1.8 | 0.3–1.8 | ||||
C3HF4Br3 | 0.5–2.2 | 0.5–2.2 | ||||
C3HF5Br2 | 0.9–2.0 | 0.9–2.0 | ||||
C3HF6Br | 0.7–3.3 | 0.7–3.3 | ||||
C3H2FBr5 | 0.1–1.9 | |||||
C3H2F2Br4 | 0.2–2.1 | 0.2–2.1 | ||||
C3H2F3Br3 | 0.2–5.6 | 0.2–5.6 | ||||
C3H2F4Br2 | 0.3–7.5 | 0.3–7.5 | ||||
C3H2F5Br | 0.9–1.4 | 0.9–1.4 | ||||
C3H3FBr4 | 0.08–1.9 | 0.08–1.9 | ||||
C3H3F2Br3 | 0.1–3.1 | 0.1–3.1 | ||||
C3H3F3Br2 | 0.1–2.5 | 0.1–2.5 | ||||
C3H3F4Br | 0.3–4.4 | 0.3–4.4 | ||||
C3H4FBr3 | 0.03–0.3 | 0.03–0.3 | ||||
C3H4F2Br2 | 0.1–1.0 | 0.1–1.0 | ||||
C3H4F3Br | 0.07–0.8 | 0.07–0.8 | ||||
C3H5FBr2 | 0.04–0.4 | 0.04–0.4 | ||||
C3H5F2Br | 0.07–0.8 | 0.07–0.8 | ||||
C3H6FBr | 0.02–0.7 | 0.02–0.7 | ||||
Group VIII | ||||||
CH2BrCl Chlorobromomethane | 0.37 | 0.12 | 0.12 |
The numbers in the “ODP1” column are from the Montreal Protocol. Some numbers have been updated as per amendments to the Protocol.
Data in the “ODP2” column come from WMO’s Scientific Assessment of Ozone Depletion: 2010.1 ODP values listed are semi-empirical and can be found in Table 5-1 of the document.
The numbers in the “GWP1” column represent global warming potentials over a 100-year time horizon. The numbers are from the Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report: Climate Change 2007 (AR4).2 The values listed are for direct radiative forcing and can be found in Table 2.14 of the “Physical Science Basis” contribution to the report.
The numbers in the “GWP2” column also represent global warming potentials over a 100-year time horizon. The numbers are from the IPCC Fifth Assessment Report: Climate Change 2014 (AR5). The values listed are for direct radiative forcing and can be found in Table 8.A.1 of the “Physical Science Basis” contribution to the report.3
Chemical Name | Lifetime, in years | ODP1 (Montreal Protocol) | ODP2 (WMO 2011) | GWP1 (AR4) | GWP2 (AR5) | CAS Number |
---|---|---|---|---|---|---|
HCFC-21 (CHFCl2) Dichlorofluoromethane | 1.7 | 0.04 | 151 | 148 | 75-43-4 | |
HCFC-22 (CHF2Cl) Monochlorodifluoromethane | 11.9 | 0.055 | 0.04 | 1810 | 1760 | 75-45-6 |
HCFC-31 (CH2FCl) Monochlorofluoromethane | 0.02 | 593-70-4 | ||||
HCFC-121 (C2HFCl4) Tetrachlorofluoroethane | 0.01-0.04 | 354-14-3 | ||||
HCFC-122 (C2HF2Cl3) Trichlorodifluoroethane | 0.02-0.08 | 59 | 354-21-2 | |||
HCFC-123 (C2HF3Cl2) Dichlorotrifluoroethane | 1.3 | 0.02 | 0.01 | 77 | 79 | 306-83-2 |
HCFC-124 (C2HF4Cl) Monochlorotetrafluoroethane | 5.9 | 0.022 | 2837-89-0 | |||
HCFC-131 (C2H2FCl3) Trichlorofluoroethane | 0.007–0.05 | 359-28-4 | ||||
HCFC-132b (C2H2F2Cl2) Dichlorodifluoroethane | 0.008–0.05 | 1649-08-7 | ||||
HCFC-133a (C2H2F3Cl) Monochlorotrifluoroethane | 0.02–0.06 | 75-88-7 | ||||
HCFC-141b (C2H3FCl2) Dichlorofluoroethane | 9.2 | 0.11 | 0.12 | 725 | 782 | 1717-00-6 |
HCFC-142b (C2H3F2Cl) Monochlorodifluoroethane | 17.2 | 0.065 | 0.06 | 2310 | 1980 | 75-68-3 |
HCFC-221 (C3HFCl6) Hexachlorofluoropropane | 0.015–0.07 | 422-26-4 | ||||
HCFC-222 (C3HF2Cl5) Pentachlorodifluoropropane | 0.01–0.09 | 422-49-1 | ||||
HCFC-223 (C3HF3Cl4) Tetrachlorotrifluoropropane | 0.01–0.08 | 422-52-6 | ||||
HCFC-224 (C3HF4Cl3) Trichlorotetrafluoropropane | 0.01–0.09 | 422-54-8 | ||||
HCFC-225ca (C3HF5Cl2) Dichloropentafluoropropane | 1.9 | 0.025 | 0.02 | 122 | 127 | 422-56-0 |
HCFC-225cb (C3HF5Cl2) Dichloropentafluoropropane | 5.9 | 0.033 | 0.03 | 595 | 525 | 507-55-1 |
HCFC-226 (C3HF6Cl) Monochlorohexafluoropropane | 0.02–0.1 | 431-87-8 | ||||
HCFC-231 (C3H2FCl5) Pentachlorofluoropropane | 0.05–0.09 | 421-94-3 | ||||
HCFC-232 (C3H2F2Cl4) Tetrachlorodifluoropropane | 0.008–0.1 | 460-89-9 | ||||
HCFC-233 (C3H2F3Cl3) Trichlorotrifluoropropane | 0.007–0.23 | 7125-84-0 | ||||
HCFC-234 (C3H2F4Cl2) Dichlorotetrafluoropropane | 0.01–0.28 | 425-94-5 | ||||
HCFC-235 (C3H2F5Cl) Monochloropentafluoropropane | 0.03–0.52 | 460-92-4 | ||||
HCFC-241 (C3H3FCl4) Tetrachlorofluoropropane | 0.004–0.09 | 666-27-3 | ||||
HCFC-242 (C3H3F2Cl3) Trichlorodifluoropropane | 0.005–0.13 | 460-63-9 | ||||
HCFC-243 (C3H3F3Cl2) Dichlorotrifluoropropane | 0.007–0.12 | 460-69-5 | ||||
HCFC-244 (C3H3F4Cl) Monochlorotetrafluoropropane | 0.009–0.14 | |||||
HCFC-251 (C3H4FCl3) Monochlorotetrafluoropropane | 0.001–0.01 | 421-41-0 | ||||
HCFC-252 (C3H4F2Cl2) Dichlorodifluoropropane | 0.005–0.04 | 819-00-1 | ||||
HCFC-253 (C3H4F3Cl) Monochlorotrifluoropropane | 0.003–0.03 | 460-35-5 | ||||
HCFC-261 (C3H5FCl2) Dichlorofluoropropane | 0.002–0.02 | 420-97-3 | ||||
HCFC-262 (C3H5F2Cl) Monochlorodifluoropropane | 0.002–0.02 | 421-02-03 | ||||
HCFC-271 (C3H6FCl) Monochlorofluoropropane | 0.001–0.03 | 430-55-7 |
The numbers in the “ODP1” column are from the Montreal Protocol. Some numbers have been updated as per amendments to the Protocol.
Data in the “ODP2” column come from WMO’s Scientific Assessment of Ozone Depletion: 2010.1 ODP values listed are semi-empirical and can be found in Table 5-1 of the document.
The numbers in the “GWP1” column represent global warming potentials over a 100-year time horizon. The numbers are from the IPCC Fourth Assessment Report: Climate Change 2007 (AR4).2 The values listed are for direct radiative forcing and can be found in Table 2.14 of the “Physical Science Basis” contribution to the report.
The numbers in the “GWP2” column also represent global warming potentials over a 100-year time horizon. The numbers are from the IPCC Fifth Assessment Report: Climate Change 2014 (AR5). The values listed are for direct radiative forcing and can be found in Table 8.A.1 of the “Physical Science Basis: contribution to the report.3
This section includes links to domestic and international organizations that perform stratospheric ozone research, ozone depletion related measurement and monitoring, and other sources of stratospheric ozone science information.