Fig. 3.

The evolution of OA experimentally under dark conditions compares well to ambient observations of bbOA and OOA factors. (A) Oxidation pathway of a representative dark dry (experiment 3) and high RH (experiment 8) experiment compared to ambient observations of bbOA and OOA factors (SI Appendix, Tables S2 and S3). (B) The OA mass spectra in the dark dry experiment as measured by the HR-ToF-AMS of the fresh bbOA in the chamber compared to the bbOA in Athens and Patras, and (C) the produced OOA in the chamber compared to OOA factors in Athens and Patras.