The purpose of this study was to determine the dust concentration in the atmosphere, and to radiative forcing aerosols, WRF-Chem numerical model and GOCART scheme have used to perform the calculations and simulations. The model has run under two conditions taking into account the effect of dust on radiation and without considering this effect. To evaluation, the results of the model, the reported horizontal vision data from two stations of the Meteorological Organization of Iran have compared with the simulated concentration by model. The result shows that this model has an acceptable performance in simulating dust storms. The results of simulation with the model in two modeling states show that dust particles by absorption and scattering radiation decrease short-wave radiation and increase in long-wave radiation at the surface of the affected areas.