Rate constants for the reaction of ozone with n-butyl acrylate (BUAC) and ethyl methacrylate (ETMEAC) have been investigated for the. first time. At 293 +/- 1 K and atmospheric pressure, the measured values were (2.40 +/- 0.29) x 10 (18) cm(3) molecule (1) s (1) for BUAC and (7.68 +/- 0.88) x 10 (18) cm(3) molecule (1) s (1) for ETMEAC. The atmospheric lifetimes have also been estimated, which indicate that only in the polluted areas could reaction with ozone be one of the important sinks for these unsaturated esters. (C) 2009 Elsevier B. V. All rights reserved.