Pleae find my comments in the attaached file.

This is a quite complete paper about the evolution of the planetary boundary layer and its relationship with the recorded concentrations at a polluted site in Germany. Stuttgart was the selected site and the period investigated extended for February 5^th to March 5^th in 2018. Although this period is short, the equipment used is formed by a scanning aerosol lidar, an aerosol mass spectrometer, an aethalometer, a condensation particle counter, an optical particle counter, trace gas sensors and meteorological sensors. Measurements of these devices are presented. Moreover, experimental observations are contrasted with model simulations. The paper focused on the planetary boundary layer evolution during certain days and the role played by clouds. Additionally, a longer database, which extended form January 1^st 2020 to January 1^st 2022, was used to present the daily evolution of PM₁₀ concentrations and the boundary layer height. Consequently, the paper merits to be published in Atmospheric Chemistry and Physics after the introduction of the following minor changes.

Since the period investigated is short, only one month, the results representativeness could be questioned. Hence, the authors should indicate if their results are robust enough.

Moreover, some orographic features are in the surroundings. The authors should comment the influence of such features on the planetary boundary layer evolution following varied wind directions. A short comment about possible processes such as anabatic or katabatic winds would increase the value of this paper.

Daily evolution of PM₁₀ and boundary layer is presented by a two-year database. The authors should explain discrepancies between this evolution and that observed in their one-month period.

The authors should indicate the reasons to select some specific days, such as February 13^th or 14th.

Finally, future research lines could be introduced at end of conclusions.

Minor remarks.

Figure 1. Indicate if 1 km and 10 m are the network resolutions. Moreover, magnitudes and units in scales must be introduced.

L. 148. Replace “haar” by “Haar”.

L. 154. Replace “Z_min” by “z_min”.

L. 250, Replace “labled” by “labeled”.

L. 301. Replace “conclud” by “conclude”.

Figure 9. Labels should be introduced.

References should follow the journal style.

L. 716. Replace “Fro¨hlich” by “Fröhlich”.