Chemical Formula t(yrs) BI (atm1 cm2) GWpa Carbon Dioxide CO2 120.0 1 Methane CH4 21 NOx 40 Nitrous Oxide N2O 310 Dichloromethane CH2Clz 0.5 1604 9 Trichloromethane CHCI3 25 Tetrachloromethane CCk 47.0 1195 1300 1,1,1-trichloroethane CH3CCl3 6.1 1209 100 CFC (hard) 7100 CFC (soft) 1600 CFC-11 CClF 60.0 2389 3400 CFC-12 CClF2 120.0 3240 7100 CFC-13 CCIF3 13000 CFC-113 CCLFCCIF2 90.0 3401 4500 CFC-114 CCIF2CCIF2 200.0 4141 7000 CFC-115 CF3CCIF2 400.0 4678 7000 HALON-1211 CBrCIF2 4900 HALON-1301 CBrF3 4900 HCFC-22 CF2HCI 15.0 2554 1600 HCFC-123 C2F3HCl2 1.7 2552 90 HCFC-124 C2F4HCI 6.9 4043 440 HCFC-141b C2FH3Cl2 10.8 1732 580 HCFC-142b C2F2H3Cl 19.1 2577 1800 FC-125 C2HFs 3400 HFC-134a CH2FCF3 1200 HFC-143a CF3CH3 3800 HFC-152a C2HF2 150 Perfluoromethane CF4 6500 Perfluoroethane CF6 9200 Perfluoropropane C3Fs 7000 Perfluorobutane C4F10 7000 Perfluoropentane CsF12 7500 Perfluorohexane C6H14 7400 Perfluorocyclobutane C-C4F8 8700 Sulfur hexafluoride SF6 23900 adapted from 1995 IPCC Report (IPCC,1996 and 1994). a (100 year time horizon) t is the tropospheric reaction lifetime (hydroxyl radical reaction dependent)(WMO,1990a- 1992b) BI is the infrared absorbance band intensity (Pouchert,1989;U.S.EPA,1997b)