Dear Dr. Schneidemesser,

thank you for submitting a revised manuscript and responding to the reviewer’s comments. Before final publication I suggest a couple of corrections and clarifications.

I would generally recommend to be more specific that the measured OH reactivity is based on the available data from NMVOC mixing ratio measurements which is, by definition, always a lower limit.

Further suggested changes:
929 ‘the reactivity of measured compounds’
531 change to ‘spectrometer’
620-622: I suggest to shorten this sentence. The cited voltages are not of great interest from a performance point of view. More important information that should be given here is the E/N ratio (and / or pdrift and Udrift) at which the experiments were performed.
1230: Correct to: If all missing NMVOCs were measured it could influence our results, including the contribution of biogenics and other compound classes to the calculated OH reactivity.

I would also like to point out that a recent publication on urban NMVOC has been highlighted in Science magazine, which could be discussed in context of this study (e.g. introduction) http://science.sciencemag.org/content/359/6377/760.

Best regards, Thomas Karl