Formation of oligomeric hydroperoxides involving Criegee intermediate was observed.
Oligomeric hydroperoxides were observed in both gaseous and aerosol phases.
Formation of oligomers involving carbonyls was observed in aerosols by PTR-MS.
Partitioning of products between gaseous and aerosol phases was determined.
Saturated vapour pressures of some oligomeric hydroperoxides were estimated.