Abstract: The concentration of the main air pollutants (SO₂, NO_x) were measured from 26 Jan. to 2 Feb. in 2000 in the Beijing urban districts. Utilizing the measured data, a preliminary research on the relation between the weather condition and air pollution is made. The results show that the concentration of air pollutants increases sharply in the condition unfavorable to air diffusion. Along with the changes of the weather condition, the concentration of air pollutants varies correspondingly. Furthermore, at the same height, different resuls are obtained in the rooms of different direction, which is much more obvious in the weather conditions unfavorable to air diffusion.