Dear Nobuyuki Takegawa

your manuscript is close to being accepted for publications.

The only remaining issue concerns one reviewer's comment which has not been answered.

The reviewer's comment is:
(5) Lns 86-88: The authors state that the instruments used during the measurement at NRT have previously been used for airborne measurements. More pertinent to the discussion is how the instruments used in this study varied from earlier studies of aircraft emissions at airports.

Your response is:
The UCPC and CPC used for the field measurements were exactly the same as those used for airborne measurements in our previous studies, except for the dilution/heater sections.
Lines 125-127

The reviewer is asking for clarification of the state how the instruments used for the measurements in this campaign varied from those used in earlier airport runway emission measurements. The authors state that the UCPC and CPC were the same as those used for airborne measurements. However, that is not relevant in the context of emission measurements from active runways. The details on the instruments and how they differed from previous measurements will help the reader put into context the results from earlier studies and this one.

Please update the text accordingly.

Best wishes

Andreas

Dear Nobuyuki

I am happy to accept your revised manuscript for publication in ACP.
No further revisions are required.

Best wishes

Andreas