Terpene-derived acids formed through the atmospheric gas-phase oxidation of terpenes are able to efficiently undergo a phase transfer into the aqueous phase. The subsequent aqueous-phase oxidation of such compounds has not been intensely studied. Accordingly, the aqueous-phase second-order rate constants of the oxidation reactions of cis-pinonic acid (CPA) and (+)-camphoric acid (+CA) with hydroxyl radicals ((OH)-O-center dot), nitrate radicals (NO3 center dot), and sulfate radicals (SO4 center dot-) were investigated as a function of temperature and pH in the present study. For CPA and +CA the following (OH)-O-center dot reaction rate constants at T = 298 K are determined: k(second)(CPA, pH<2) = (2.8 +/- 0.1) x 10(9) L mol(-1) s(-1), k(second)(CPA, pH>8) = (2.7 +/- 0.3) x 10(9) L mol(-1) s(-1), k(second)(+CA, pH<2) = (2.1 +/- 0.1) x 10(9) L mol(-1) s(-1), k(second)(+CA, pH=5.3) = (2.7 +/- 0.3) x 10(9) L mol(-1) s(-1), k(second)(+CA, pH>8) = (2.7 +/- 0.1) x 10(9) L mol(-1) s(-1). In order to assess the atmospheric impact of the aqueous-phase oxidation of such compounds, atmospheric aqueous-phase lifetimes were calculated for two model scenarios based on CAPRAM 3.0i. The aqueous-phase oxidation under remote conditions emerges to be the most favored pathway with lifetimes of 5 +/- 1 h.