Thank you for providing a thorough and considered response to the referees’ comments. I am satisfied with the revised manuscript and am happy to accept it for publication in ACP subject to some minor technical corrections.

1) Referee #1 made the point that the term IVOCs is misleading as the manuscript only considers 5 IVOCs. Whilst you have addressed this in the text, this term still appears in the legends and captions of Figures 6, 7 and 8. Please could you make similar changes to make the meaning clear in these figures.
2) Page 19, Line 21. Modify “On the opposite” to “Conversely”.
3) Page 24, Lines 1-6. This is some text changed in response to Referee #1. Suggest changing “not only diesel emits less CO than gasoline”” to “not only do diesel-fuelled vehicles emit less CO than gasoline-fuelled vehicles”. I assume the change from “13 times” in the original manuscript to “14 times” in the revised manuscript is due to the changed reference and specific mention of heavy duty and light duty vehicles.
4) Page 28, Line 22-25. In response to both referees you have changed the conclusion regarding the cause of the seasonality in the C12-C16 n-alkanes. Whilst this is the right thing to do, I think the wording of the “cause” is too strong as you don’t actually provide any evidence for changes in emission sources. I think it should be changed to “most likely results from” or “probably results from”.
5) Page 26, Line 9. Change “And thus” to “Therefore”.