This study conducted field measurements of gaseous organic nitrates at an urban site and assessed their effects on local O3 production using a box model incorporating an updated mechanism. Organic nitrates formation and its contribution to SOA and effect on O3 are of great concern to the researchers. My main question about this work is the performance of the model simulations. The author used three mechanisms to simulate ONs, but as can be seen in Figure 4, the model simulated the concentration levels of ANs but poorly simulated the trend of ANs. It appears that the trend of simulated and observed ANs are opposite. The effectiveness of the model simulation affects the later analysis of ANs and the authors need to give an explanation. What about the R2 of the model simulation? Why does Zare's model that considers the ON formation initiated by OH and NO3 not work well compared to other models? Some specific comments are also provided below.

1, section 3.1, The authors divided the entire campaign into ozone pollution days, clean days, and background days. What are the specific criteria for dividing the clean and background days? How do precursors and environmental factors affect ANs and PNs on different days? The authors are also suggested to compare the effects of ANs and PNs on O3 on different days in the later analysis.

2, Line 242-256, compare ANs and PNs in Shanghai and Xinjin. And Line 329-337, the reduced inhibition of PNs on ozone production in Shanghai compared to Xinjin was attributed to the lower PNs production rate. The authors did not do further modeling analysis here, but it is suggested that the authors provide a reasonable discussion.

3, Line 378-411, The Fig. 10 was missing. Regarding the sensitivity of VOCs reactivity and α to the effect of ANs formation on O3 production, it is suggested that the authors make more comparisons of the results of the most recent studies or those from China. In addition, I would like to know if the authors have tested the sensitivity of VOCs reactivity and α for different days, i.e. ozone pollution, clean and background days and what are the differences in the results?