Dear authors,

There are a couple technical corrections that I would like to see before publishing the paper to ACP.

1) The colorbars in some of the supplementary figures is pretty bad. I am referring to the ones where zero values are black (e.g. S9). Can you use the colorbar used in e.g. S10 instead? Also, for the figures using the S10 colorbar, the saturated colors on both sides are almost the same, can you make them a bit more distinct?

2) If I understand correctly your answer to the major comment of reviewer 2 (and some of the specific comments come back to this), your statement added in page 4 line 18 "Although, the NH3 uptake process does not directly impact the mass of SOA, it can affect the SOA mass indirectly as particle acidity is altered due to this process, which will be discussed in section 3.2.3. " means that part of NH3 is lost so less is available to form NH4+ which is why acidity is affected. This should be clearly stated here, since a couple sentences later you say that "The ability of NOCs to neutralize inorganic acids is not considered (see Figure S1.)", which is the opposite of what you say in the previous statement, as a standalone sentence. I had to dig deeply in the text of section 3.2.3 to figure this out, can you make it more visible here instead of simply referring to the section?

Following these corrections I the paper can be accepted for publication to ACP.

Kind regards,
Kostas Tsigaridis