Mass accommodation coefficients on aqueous droplets have been measured for two substituted aromatic compounds using a droplet train apparatus and detection in the gas phase by laser induced fluorescence. Values of (1.8¿0.5)¿10-2 and (2.7¿0.5)¿10-2 have been obtained at 283 K for aniline and phenol, respectively. Mass accommodation of toluene was below the limit of detection of 1.0¿10-3. Phenol and aniline are chosen as models for polar and oxygenated species formed as Cy intermediates in the oxidation of less soluble aromatic hydrocarbon precursors. The measurements indicate that mass accommodation of such species could be a significant pathway for the removal of tropospheric hydrocarbons. ¿ American Geophysical Union 1995