Measurements of the rate constants for the gas phase reactions of OH radicals with bromoform (CHBr₃) and epichlorohydrin (C₃H₅ClO) were performed using a flash photolysis resonance-fluorescence technique over the temperature range 230−370 K. The temperature dependences of the rate constants can be represented by the following expressions: k_BF(230−370 K) = (9.94 ± 0.76) × 10⁻¹³ exp[−(387 ± 22)/T] cm³molecule⁻¹s⁻¹ and k_ECH(230−370 K) = 1.05 × 10⁻¹⁴(T/298)^5.16 exp(+1082/T) cm³molecule⁻¹s⁻¹. Rate constants for the reactions of OH with CHCl₂Br and CHClBr₂ were measured between 230 and 330 K. They can be represented by the following expressions: k_DCBM(230−330 K) = (9.4 ± 1.3) × 10⁻¹³ exp[−(513 ± 37)/T] cm³molecule⁻¹s⁻¹ and k_CDBM(230−330 K) = (9.0 ± 1.9) × 10⁻¹³ exp[−(423 ± 61)/T] cm³molecule⁻¹s⁻¹. The atmospheric lifetimes due to reactions with tropospheric OH were estimated to be 57, 39, 72, and 96 days, respectively. The total atmospheric lifetimes of the Br-containing methanes due to both reaction with OH and photolysis were calculated to be 22, 50, and 67 days for CHBr₃, CHClBr₂, and CHCl₂Br, respectively.