The formation yields of OH radical, propanal, and ethane from the reactions of ozone with Z-3-hexenal (3HA) and Z-3-hexen-1-ol (3HO) were measured under atmospheric conditions. These OH yields were determined to be 0.32 +/- 0.07 for 3HA and 0.28 +/- 0.06 for 3HO. The relative formation yield of the C2H5CHOO intermediate was estimated based upon the formation yields of propanal and ethane, which consistently suggested that C2H5CHOO is formed more efficiently from the O-3 + 3HA reaction than from the 3HO reaction.