The Influence of Air Pollution on Solar Insolation in the Datong City

Based on the facts that the solar insolation and sunshine condition in Datong is getting worse and the smoke screen days is more than before, the influence of air pollution on solar insolation and its variation in Datong are estimated by using the observational data of surface solar insolation from 1963 to 1987. It is shown that the decrease of solar insolation is greatly related to the influence of mixing pollutants and there is a good correlation between the annual variation of solar insolation and the turbidity factor.