40 CFR Part 82, Appendix I — Global Warming Potentials (Mass Basis), Referenced to the Absolute GWP for the Adopted Carbon Cycle Model CO2 Decay Response and Future CO2 Atmospheric Concentrations Held Constant at Current Levels. (Only Direct Effects Are Considered.)

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗

Species (chemical)	Chemical formula	Global warming potential (time horizon)
20 years	100 years	500 years
CFC-11	CFCl3	5000 \| 4000 \| 1400
CFC-12	CF2 Cl2	7900 \| 8500 \| 4200
CFC-13	CClF3	8100 \| 11700 \| 13600
CFC-113	C2 F3 Cl3	5000 \| 5000 \| 2300
CFC-114	C2 F4 Cl2	6900 \| 9300 \| 8300
CFC-115	C2 F5 Cl	6200 \| 9300 \| 13000
H-1301	CF3 Br	6200 \| 5600 \| 2200
Carbon Tet	CCl4	2000 \| 1400 \| 500
Methyl Chl	CH3 CCl3	360 \| 110 \| 35
HCFC-22	CF2 HCl	4300 \| 1700 \| 520
HCFC-141b	C2 FH3 Cl2	1800 \| 630 \| 200
HCFC-142b	C2 F2 H3 Cl	4200 \| 2000 \| 630
HCFC-123	C2 F3 HCl2	300 \| 93 \| 29
HCFC-124	C2 F4 HCl	1500 \| 480 \| 150
HCFC-225ca	C3 F5 HCl2	550 \| 170 \| 52
HCFC-225cb	C3 F5 HCl2	1700 \| 530 \| 170

AUnited Nations Environment Programme (UNEP), February 1995, Scientific Assessment of Ozone Depletion: 1994, Chapter 13, “Ozone Depleting Potentials, Global Warming Potentials and Future Chlorine/Bromine Loading,” and do not reflect review of scientific documents published after that date.

[61 FR 1285, Jan. 19, 1996]