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Figure 1

From: Enhanced Volatile Organic Compounds emissions and organic aerosol mass increase the oligomer content of atmospheric aerosols

Figure 1

Mass spectra of secondary organic aerosol (SOA) collected at the remote boreal forest site in Hyytiälä, Finland.

(a) SOA from samples collected in summer 2011 show only a small number of components in the oligomeric mass region (ions above m/z 280) and no components above m/z 450 where terpene-trimers are observed (see Fig. 2a–c). (b) SOA from samples collected in summer 2014 with clear features in the oligomeric, high molecular mass range up to m/z 600. Red lines correspond to ions in the oligomeric region which intensities have been multiplied by a factor of 5.

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