Based on discussion with the two reviewers, I find further revisions are necessary on the following points:

1. The reviewer #1 requested discussion on how the uncertainty in emission inventories propagates into derived contributions. Although the uncertainties are added to Table in supplementary, no discussion is made. Key issues would be how NOx and anthropogenic VOC concentrations are reproduced by the model simulations. I assume anthropogenic VOC concentrations are measurable from samples for isoprene and monoterpenes. If not, alternative way of evaluation should be proposed.

2. Similarly, discussion on the potential impact from the isoprene chemical mechanism is still weak. The reviewer #1 requested justification why the new isoprene chemistry mechanism does not impact the results. However such justification is not present, although impact in other studies is cited. The authors mentioned "the impacts of biogenic VOCs on O3 formation may vary in different regions and different seasons." The impact of new isoprene chemistry mechanism could be different too, and therefore case study for Guanzhong Basin is necessary.

3. The authors mentioned that sampling was conducted between 9:30-16:30 LT. Were the sampling CONTINUED for 7 hours? Or the short-time samplings were done during the period? Clarification is necessary.

4. Point 3 of reviewer #2. I also feel impact of aerosols (that the authors claim) on J(NO2), 40-60%, is a bit too large.
TUV calculations (http://cprm.acom.ucar.edu/Models/TUV/Interactive_TUV/) to yield 40% lower J(NO2) require AOD=1 and single scattering albedo (SSA) =0.8, or AOD=2 and SSA=0.93. The authors should raise AOD (in addition to PM) and expected SSA during the studied period, to justify that large impact.

5. Section 4.1. Is the unit for VOCs ppb or ppbC? What are the dominant VOCs for 50 or 30 ppb that the authors discussed?

Dear Authors,

Point regarding isoprene chemistry mechanism needs further justification: Besides sensitivity on nitrate yield, production of radicals from Isoprene RO2 radicals should be discussed. For example, see CheT2 mechanism (ISO2 + N2/O2), in Table 2 of Squire et al. (ACP 2015, https://www.atmos-chem-phys.net/15/5123/2015/acp-15-5123-2015.pdf)

Yugo Kanaya, ACP Co-editor

Dear authors,

The last point is now adequately addressed. I am happy to accept your manuscript.

Yugo Kanaya, ACP Co-editor