Naphthalene‐Derived Secondary Organic Aerosols Interfacial Photosensitizing Properties

We investigated the photosensitizing properties of secondary organic aerosol (SOA) formed during hydroxyl radical (OH) initiated oxidation naphthalene. This SOA was injected into an flow tube and exposed to UV radiation gaseous volatile compounds or sulfur dioxide (SO2). The particles were observed grow in size by photosensitized uptake d-limonene β-pinene. In presence SO2, a production (0.2–0.3 µg m−3 h−1) sulfate at all relative humidity (RH) levels. Some also on dark, probably due peroxides. dark photochemical pathways exhibited different trends with RH, unraveling contributions from bulk surface chemistry. As naphthalene other polycyclic aromatics are important precursors urban suburban areas, these reactions likely play role formation.