Thanks for attending to the reviewer’s comments. I think you have answered them adequately, but I do have a few comments on your response and the revised manuscript. I will note the page number but since you didn’t provide line numbers, you may have to hunt to find the location.
Page 3, Kolkata is spelled two different ways.
Page 5. What is the parameter ‘n’ equation (3)?
Page 8. Does India use MTBE as a fuel additive?
Page 9, first paragraph. If two wheelers are more abundant in small towns, it seems like there should be some independent data on this.
Page 17. Response to reviewer’s comments RE Section 2.3. It would be useful to note that relative uncertainties are most important here, as absolute uncertainties often cancel out among species measured by the same instrument.
Page 18. End of paragraph 1, ‘uncertainty’.
Page 18. Start of paragraph 4, ‘serious’ should be ‘series’.
Figure 3. I can no longer distinguish the blue and green color bars in the top panel.
References. There are a number of typos in this section, please review carefully.

Thanks for attending to those last few points.