Objective To study the features of ultraviolet intensity in Zhengzhou in order to provide scientific basis of sun protection for inhabitants in this city,including normal population,and patients With photosensitive disorders and ultraviolet related skin cancers.Methods The ultraviolet A and ultraviolet B intensities of one year's duration in Zhengzhou were measured and their statistical differences in the four seasons of the year and at the five measured time points of daytime were compared respectively.Res...