Interactive comment on “Evaluating th d gree of oxygenation of organic aerosol during foggy and hazy days in Hong Kong using high-resolution time-of-flight aerosol mass spectrometry (HR-ToF-AMS)” by Y. J. Li et al

This paper presents an interesting contrast between foggy and hazy periods of various AMS variables indicating degree of OA oxidation or volatility. The results are likely to be of particular interest to the AMS community, but some of the findings are also of general interest to those investigating secondary organic aerosol formation. Although the data is interesting, in my view the author’s way over interpret the data. The last line of the abstract and first line of the conclusions are strong statements despite no physical or chemical process actually being measured in this study.