The changes in the concentration and phase state of organic aerosol particles during dehydration into the surrounding gas phase can be drastic, with sampled atmospheric secondary organic aerosol (SOA) particles exhibiting viscosities consistent with a glass under dry conditions.1 Such a phase state is found to have a pronounced slowing effect on the evaporation of semi-volatile organic compounds (SVOCs). This may have ramifications for mass loadings and size distributions of organic aerosol in common atmospheric conditions.2
