This paper is valuable in that it utilizes the PALM LES model to perform air quality modeling in Prague, Czech Republic under stable condition, identifying and presenting potential factors can cause simulation errors. The research is based on various efforts, including elaborated experimental designs and observation campaign, and the structure is well organized.  Based on the manuscript, the following comments are proposed:

- Major comments:

1) This study focuses on PM10 verification at a single point, even though the scale of the experiment and observation sites is quite large. It would be good to first discuss the overall chemical or meteorological field simulation performane of the PALM.

2) How can we discuss the accuracy of the emission data prescribed in the model, and what IC/BC selection criteria can be presented since the accuracy of it will vary from point to point?

- Specific comments: 

1)  P2. L20: “and” is omitted between radiation and wind field.

2) P9. L201: The observation site name of “Praha 2-Libus” is written with various names like “Praha C-Libus(P8 of supplements) or Praha 4-Libus(Most of the paper)”, causing confusion.

3) P13, L298: maximal should be changed to ‘minimal’ because it is the lowest limit.

4) P13, L300: It seems correct that Fig. 8 is cited, not Fig. 7

5) P21, L415: I couldn’t catch up on what the cycle means in the sentence.

6) Fig. 4 and 7: Captions should be written consistently because the two figures handled similar information. I don’t understand why the observed values were drawn differently in both figures even though it was the same time. Additionally, I don’t agree with the statement that the results generally follows the BC profiles in P15, L365.

7) Fig. 4, 5, 7: It would be nice if time was added not only to the captions but also to each figure

8) Fig. S01-04 in Supplements: In my opinion, the terrain height plotted in yellow is not that important information in those figures. Instead, it would be better to recognize the map if the ocean was colored in skyblue like the lake.