Dear authors, Thank you very much for your efforts in improving you manuscript following the reviewer comments. However, additional corrections are needed as clearly explained in one reviewer's comments. I kindly ask you to carefully take into consideration the reviewer's comments and implement them in a revised version that will be further considered for publication. with kind regards, Maria Kanakidou

Thank you very much for your efforts in improving your manuscript. However, some additional changes are necessary.
1) section 4.1 on Air quality exceedances should be a separate section number 5.
2) most (I would even say all) of the conclusion, as now modified, from page 28 line 28 to the end, expect the last statement, contains mainly a lot of discussion on the uncertainties based on literature. Although this is very useful I consider this should be part of section 4 on uncertainties and not of the conclusions. Therefore I suggest you move it there.
3) please also re-read the conclusions and avoid repetitions with the main text.
with kind regards,
the co-editor, Maria Kanakidou

Thank you for the latest revision of your manuscript. I suggest a small addition, page 24, line 1. start the sentence ' Several models...' as follows : 'While a fraction of REM-PM2.5 can be due to the low diameter of dust particles, several models...'
Otherwise the paper can be now published in ACP. I have no objection to the authors' request that this moves to the special issue of CharMEx which is also acknowledged in the manuscript. kind regards, the co-editor, Maria Kanakidou