The study from Zheng et al. is a comment on the study by Chen et al. (2022). Chen et al. (2022) demonstrated that the intrusion of stratosphere ozone induced by Typhoon Infa served as a potential source of surface ozone, and the following shallow local mesoscale convective systems facilitated the downward transport of this potential ozone source to the surface, and led to a nocturnal ozone enhancement (NOE) event in the North China Plain (NCP). Zheng et al. analyzed observations (including PAN, VOCs) from the ZiBo supersite at eastern NCP, and argued that the NOE event originated from fresh ozone photochemical production in the lower troposphere rather than from the stratosphere as pointed out by Chen et al. (2022). This is supported by 1) comparable nighttime surface Ox and daytime O3 levels, 2) a strong correlation between PAN and ozone during the NOE event, and 3) the short photochemical ages of air mass. Overall, the study provides strong observational evidence on the conclusion, and is well-designed and well-written. I suggest some revisions before publication.

While I agree with Zheng et al. that the mixing of ozone produced photochemically and stored in the residual layer has a large contribution to the Zibo NOE event, it does not necessarily exclude the possibility of stratospheric contribution proposed by Chen et al. (2022). Zheng et al. mainly used observations at ZiBo city, however, as seen from Figure 8 of Chen et al. (2022), there is limited vertical atmospheric activity near the ZiBo supersite, as the main convective zone is located in the western Shandong Province. So the difference in the study region between Chen et al. (2022) and Zheng et al. may also contribute to the different conclusions. I would suggest the authors consider this point in their analysis.

One small comment is to clarify O3 as “daytime O3” and Ox as “nighttime Ox” in Table 1.