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General Comments The manuscript describes the introduction of stretched-grids for GEOS-Chem in its high-performance implementation GCHP. It demonstrates its abilities in high-resolution modeling by performing two refined simulations, one for the contiguous US using broad refinement, and one for California with a strong refinement of about 10 km. Comparison with TROPOMI tropospheric NO2 retrievals reveals reasonable spatial agreement of the simulated columns, while computational expenses can bedoi:10.5194/gmd-2020-398-rc1 fatcat:lsheuxf6mbfrziu47xnesuxwr4