Long path length FTIR/smog chamber techniques were used to study the kinetics of the reactions of Cl atoms and OH radicals with CF3CBr=CH2 and CF3CF2CBr=CH2 in 700 Torr of N-2 or air diluent at 296 +/- 2 K. The reactions proceed with rate constants of k(Cl + CF3CBr=CH2) = (9.20 +/- 0.54) x 10 (11), k(OH + CF3CBr=CH2) = (4.21 +/- 0.45) x 10 (12), k(Cl + CF3CF2CBr=CH2) = (8.44 +/- 0.51) x 10 (11), and k(OH + CF3CF2CBr=CH2) = (3.48 +/- 0.34) x 10 (12) cm(3) molecule (1) s (1). The atmospheric lifetimes of CF3CBr=CH2 and CF3CF2CBr=CH2 are approximately 2.8 and 3.4 days, respectively. These compounds will not contribute significantly to radiative forcing of climate change. (C) 2009 Elsevier B. V. All rights reserved.