As for the inhomogeneous smog environment caused by the sedimentation phenomenon of smog, the relations of inhomogeneous environment parameters in the experiment and the simulation are established by the usage of the Monte Carlo simulation procedure and the real-time measurement of the optical depth during the sedimentation time, which solves the delay problem in the measurements of the polarization transmission characteristics and the medium parameters in the traditional inhomogeneous environment and the measurement accuracy is also enhanced. The experimental results show that, with the increase of the concentration of the smog, all the degrees of polarization of the four kinds of polarized lights are constantly decreased; the circularly polarized light has a better polarization-maintaining characteristic with the increase of the concentration of the smog；the longer the wavelength is, the better the polarization characteristic of the circularly polarized light is;the shorter the wavelength is, the better the polarization characteristic of the linearly polarized light is.