Dear Dr Stojiljkovic and co-authors,
I am pleased to accept the revised manuscript for ACP, subject to the few technical corrections listed below. I hope you agree that the manuscript has been much improved by the review process - thank you for engaging positively in that,
Sincerely,
Rob MacKenzie

Technical corrections.
Title: I think “originating” is more grammatically correct
Page 2, line 10: to be strictly correct, the averaging time should be stated more clearly – i.e., “no more than 35 occurrences of daily mean values exceeding 50 ug/m3”
Page 3, line 15: delete “high”.
Page 4, line 12: replace “to be commonly occurring ones” with “typical”
Page 5, line 5: “pavement” should be road or road surface
Page 5, line 16. Make it clear that 50 and 70 km/h are much higher speeds than used in this study, and are presented for reference only.
Page 8, line 15: need to provide an averaging time for WHO guidelines.
Page 9, lines 25-26: replace pavement with road or road surface. Also page 11, lines21-22.
Page 9, lines 36-38. Increasing wear rate will not affect R-squared because R-squared is a measure of correlation not bias.
Page 10, line 32-35. State explicitly if the model-data agreement was improved by changing tRoof.