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. Environmental temperature plays a vital role in controlling chemical transformations that lead tothe formation of secondary organic aerosol (SOA) and ultimately impact the composition and opticalproperties of the aerosol particles. In this study, we investigated optical properties ofn-dodecane SOA under two temperature conditions: 5 and25 ∘C. It was shown that low-temperature conditions could enhance the real part of the refractiveindex (RI) of the SOA at wavelengths of 532 and 375 nm. Mass spectrometry analysisrevealed that the molecular composition of n-dodecane SOA was significantly modified by temperature:a large amount of oligomers were formed under low-temperature conditions, which led to higher RIvalues. These findings will help improve our understanding of the chemical composition and opticalproperties of SOA under different temperature conditions and will provide one possible explanation forthe low visibility in suburban areas during winter.

atmospheric chemistry and physics

Temperature effects on optical properties and chemical composition of secondary organic aerosol derived from &amp;lt;i&amp;gt;n&amp;lt;/i&amp;gt;-dodecane