Thank you very much for the careful revision of your manuscript following the comments by the reviewers. There are a few points where I consider that more actions/clarifications are needed.
1- point 3 of reviewer 1 and point 9 of reviewer 2: background OA – you are considering as background OA the amount of aerosols not explicitly considered in the model and you are counting all of it in the natural SOA. I wonder whether a part of this ‘background’ aerosol is of anthropogenic origin and after transport in the atmosphere and atmospheric again become ‘background aerosol’.
2- point 6 of Reviewer 1 for section 2.1: please also refer to the chemistry and aerosol modules you are using.
3- Point 10 of reviewer 1: I suggest rephrasing the sentence: “The SFOA factor includes biomass aerosols that are the so called BBOA as well as OA from coal and charcoal combustion.” Is this what you mean?
4- Page 3, line 25: leave the reference in the text.
5. page 14, lines 20 and 21: remove parenthesis: Recently,....simulations.
6. page 16: in the conclusions you do not need to define again ACTM and IVOC.
Please revise your manuscript accordingly. With kind regards,
Maria Kanakidou (editor)

Please remove the second 'some' from page 13, line 12. After this corrections the manuscript can be accepted for publication in ACP.
Once again thank you for submitting your manuscript to ACP. with kind regards, Maria Kanakidou (editor)