The authors have addressed resonably well to the referee comments. I have a few issues to consider before accepting for publication:

Concerning the comment 19 by ref 2, I think it would be worth adding the value of CS corresponding to the given AFuchs threshold value of 200 um2/cm3 on line 235 (for example, adding “CS= NN s-1” into parenthesis there; note the preferred unit of s-1, not cm-2s-1 in current literature). This is because most other papers report values of CS, not those of AFuchs, these days. When discussing further the AFuchs (or CS) threshold observed here, it might be beneficial to add couple of sentences on whether such threshold has been observed anywhere else (e.g. Salma et al 2016, ACP page 8715-28 found such threshold in Budabest, Hungary, but at a particle loading of CS = 0.02 s-1).

diurnal sulfuric acid -- > the diurnal sulfuric acid concentration, sulfuric acid concentration -- > the sulfuric acid concentration, sulfuric acid -- > sulfuric acid concentration (lines 50, 54, 64, 70, 84, 154, 287, 321)

Abstract, sections 2, 4 and 5: Please check out the format of presenting dates in ACP.

line 19: environments, such as in Boulder and Hyytiälä, the dayly-maximum…
line 25: 2.56, whereas the variabilities of AFuchs in…
line 77: a good correlation
line 97: please specify the size. … 10 um in particle aerodynamic diameter. ???
line 100: The particle density…
lines 120-130: I think this paragraphs would benefit from 1-3 references.
line 157: are -- > represent
line 178: the sub-3 nm…
line 183: This sentence is unclear, please modify.
line 185: …were assumed to be…
line 194, The following…

lines 205-206: However, this exponent is … from the exponents no greater…., indicating that activation or…

Line 215: what is the meaning of “p=1” here?
line 223: in measured sulfuric acid concentrations…
line 233: NPF days, whereas…
line 243: delete “the” before R2
line 265: Fig. 8), indicating high coagulation losses…
line 267: rather than were grown into larger sizes, such that…
line 287: led to…particles were

line 297-298: “nucleation mode particles formed by nucleation” does not sound good. Please define size, e.g. “particles <30 nm in diameter formed by nucleation ….”

lines 301-302: with R2 of…at a high…at a low…
line 304: severely polluted
line 305: , except…
line 308: seasons, such that…
line 313: when the daily-average
line 321: is determined
line 323: locations, such as Hyytiälä, the dayly-maximum…
line 326: , precursors, such as sulfuric acid, in …

This manuscript can be accepted for publication in its present form.

Editor