Smog chamber/FTIR techniques were used to study the gas-phase reaction of CxF2x+1C(O)O-2 (x = 1, 3, 4) with HO2 radicals in 700 Torr of air, or O-2, diluent at 296 +/- 2 K. The reactions proceed by three pathways leading to formation of CxF2x+1C(O)OOH and O-2, C2F2x+1C(O)OH and O-3, or CxF2x+1C(O)O radicals, OH radicals, and O-2. Carboxylic acid yields were 38 +/- 4% (x = 1), 10 +/- 2% (x = 3), and 8 +/- 2% (x = 4). Results are discussed with respect to the potential for the atmospheric degradation of fluorotelomer alcohols, CxF2x+1CH2CH2OH, to contribute to the environmental burden of fluorinated carboxylic acids, CxF2x+1C(O)OH. Rate constants for the reactions of Cl atoms with CxF2x+1C(O)OH and CxF2x+1C(O)OOH were determined to be k(Cl+CxF2x+1C(O)OH) < 2 x 10(-17) and k(Cl + CxF2x+1C(O)OOH) = (2.9 +/-0.7) x 10(-16) cm(3) molecule(-1) s(-1) in 700 Torr of N-2 at 296 +/- 2 K.