In this paper using indirect method inferred long variation of atmospheric quality and the seasonal variation of air pollution, by the variation of atmospheric radiation) process, transparency and turbidity in 1962-1985. Its resutl shows the urban air pollution has been developing gradually, by decreasing of radiative flux and transparency of atmosphere, increasing of atmospheric turbidity, due to increasing of pollution particle. TR-the turbidity factor of atmospheric pollutant-discussed in this paper, reflected objectively annual variation of air pollution over Fuzhou City.