Dear authors


you addressed the comments of the reviewers well. I have a few 2 further comments. Please address these two comments so that the paper can then be rapidly accepted.

Concerning IVOCs/VOCs and no measurements of cooking-IVOCs to use as a basis for modeling:
One may mention that recent new information of VOCs from cooking are available (Klein et al., 2016). However more investigations are needed how to implement these emissions into a chemical scheme.

Concerning the uncertainties of COA: In addition to the collection efficiency issues that are well described, also the PMF itself may have considerable uncertainties which should be mentioned. In Elser et al. (2016) an optimized statistical analysis was performed for data in China and the contribution of cooking dropped by more than a factor of 2 when using an optimized constrained statistical approach compared to an unconstrained PMF (see also supplementary material). One may argue that source apportionment analysis in England may be somewhat easier compared to China because of additional important sources in China (especially coal) but uncertainties in general remain and are not only due to collection efficiency.

Elser, M., et al. (2016) Urban increments of gaseous and aerosol pollutants and their sources using mobile aerosol mass spectrometry measurements, Atmos. Chem. Phys., 16(11), 7117-7134.

Klein, F., et al. (2016) Characterization of Gas-Phase Organics Using Proton Transfer Reaction Time-of-Flight Mass Spectrometry: Cooking Emissions, Environmental Science & Technology, 50(3), 1243-1250.