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Main control factors of NO3 reduction changed from gas-phase reactions to N2O5 hydrolysis with level increase. Whenever relative humidity (RH) surpassed 70% or PM2.5 level exceeded 50 μg·m-3, τNO3 had been practically lower than 300 s with blending ratio lower than 70 pptv. The clear negative dependence of τNO3 on RH and PM2.5 shows the influencing factors on indirect loss. Under polluted conditions, straight profiles of NO2, O3 and NO3 varied considerably. Stable envi