Dear authors,

although the manuscript is almost ready for publications, still some open questions remain in Sect. 3.2.2.
which was changed in the revised version.
I would strongly advice to revised again carefully the section.

For example, in the original manuscript you stated :
"Correlations of VOC with CO2 fluxes measured concurrently on site were low";
in the never version : "Generally, good correlations were found between averaged VOC and CO2 fluxes
measured concurrently at the site [...]".
The two version seems to be in contradiction and I would appreciate the authors to clarify it.

Additionally, in the revised version firstly it is mentioned that "Traffic-related compounds
were among the lowest correlations with CO2 fluxes", while few lines later it is mentioned
that "averaged VOC to CO2 concentration correlations were highest for traffic-related compounds
(R^2 = 0.92-0.96)". As the removal of the CO2 peaks did not caused such increase of correlation
(from 0.03-0.48 to 0.65-0.91 as stated in the text) what kind of averaging was giving you such high correlation? The text in section 3.2.2 must therefore be revised and made consistent and more
readable.

Best regards,

Andrea Pozzer