This study analyzed changes in the global tropospheric ozone budget, as well as the spatial-temporal variations of surface O3 in East Asia. It investigated contributions from regional emissions, intercontinental transport, and climate changes in a scenario where emissions of O3 precursors are reduced under future net-zero emissions policies based on CESM. The findings reveal that emission reductions led to a decrease in tropospheric O3, while climate changes had only a minor impact. Additionally, the contribution of biological sources to surface ozone showed a gradual increase. The research underscores the significant co-benefits of net-zero policies targeting climate change in addressing surface O3 pollution over East Asia. I recommend that this article be published with some minor modifications.

Specific Comments:

1. Line 109 and Line 122: CESM has be clarified in Line 99, it can be abbreviated directly.

1. Line 137: Should be “Modern Era Retrospective analysis for Research and Applications, version 2 (MERRA2)”

1. Line 132-133: Why didn’t you use CESM1 for both online and offline simulation.

1. Section 2.3: Ensure consistent tenses throughout Section 2.

1. Line 267-268: This explanation is confusing. A Longer chemical lifetime of stratospheric O3 may reduce its contribution to tropospheric ozone burden.

1. Line 272-273: How can weakened outflow reflect reduced regional production.

1. Line 311: Another similar table to Table 2, showing different results in winter and summer could support your attribution here.

1. Line 326-328: Can you explain why temperature increase and circulation enhance in the future? I think temperature should decrease in a net zero scenario.

1. Figure 6(c) and (d) shows the NOx and O3 chemical tendency, the explanation of the ordinate ‘rate’ needs to be clarified in more detail.

1. Line 373-374: Are there any evidences from your simulations that can support this explanation?

Please see reviewer comments in attached document.