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The objective of the present study was to better understand the impacts of the additional sources of nitrous acid(HONO)on visibility,which is an aspect not considered in current air quality models.Simulations of HONO contributions to visibility over the North China Plain(NCP)during August 2007 using the fully coupled Weather Research and Forecasting/Chemistry(WRF/Chem)model were performed,including three additional HONO sources:(1)the reaction of photo-excited nitrogen dioxide(NO2*)with water vapor,(2)the NO2 heterogeneous reaction on aerosol surfaces,and(3)HONO emissions.