Dear authors,
thank you for addressing the reviewer's comments. I have decided to accept your paper, when taking the following minor revisions into account.
l 20 clarify what you mean with observed: calculated or measured or both? Clarify what you mean with decreasing rates: I think concentration reductions, correct?
l 23 Is this a place give some more detail on which emisison reductions where more important (NOx or VOC, and link to the VOC:NOx regimes.

l 88 Please explain in one sentence what these 75 and 50 % QA effectively do, and how many or % datasets are discarded due to this.

l. 121-125 Try to find a more simple way to say which reductions were applied to very polluting, medium polluting, and low polluting industries.
l 141 Either define here what you mean with acceptable or rather not mention this.Later you mention 2 % for GE/EWS.
l 151 How does EPA (2007) pertain to Indian cities. Needs further explanation.
l 160 summing up of concentrations doesn't give columns- please explain better (equation?).
l 176 here and at various other spots. Careful use of the word trend. In this case you probably mean a tendency. In other cases you discuss a step-change rather than a trend. Check.
l 185. Interesitng to know, but explain how that affects the lockdown which was supposedly everywhere. Was it more stringently implied in Mumbai than elsewhere, it may have an implication for your model assuptions.
187- carefully check whether you really mean a decreasing trend- i.e. a trend that is getting less...Is it a trend at all?
200 attribute=>be attributed.
209 decreasing trends? Just decreases?
2016 duration of the lockdown+>
effective implementation of the lockdown?
225 improve english
229 are lower...
269 this sentence sentence needs a better explaination. You want to demonstrate that HCHO is a good proxy in the model for overall VOC, and it can be observed as well...
275-280 this is interesting but it is not clear if you are suggesting that this is important or not in understanding results.
302 Please clarify this sentence. You are not comparing pre-lockown with lock-down, but the emissions scenarios. Correct? Please give a quantitifcation of the importance of meteorology and emission in determining the change.

Congratulations, you're manuscript is now accepted for publication.