Abstract:Based on available observation data from 721 meteor ological stations for the period from 1961 to 2007, the temporal and spatial distribution characte ristics of hazes in China were analyzed. Preliminary results show that haze s occurred mainly in eastern China (east of 100°E) and southern China (south of 42°N), with some obvious high incidence centers called generally as “muddy isla nd”. Hazes occurred frequently in winter, and not inclined to happen in sum mer. In the past 47 years, hazes in China on the whole increased with a linear t endency of 3.19 days per decade and two abrupt change points, respectively i n th e mid 1970s and after the year of 2000. During 1961-1975, hazes in China were l ess than the average, keeping negative phase, then fluctuated in weak positive p hase from 1976 to 2000. In recent 5 years, 〖JP2〗hazes were increasing quickly. The correlation coefficients, inter annual scale, between hazes and t wo wind force indices (i. e. the number of days with wind force f≥5 m/s and f≥ 10 m/s) are -0.809 and -0.734 respectively. These significant negative corre lations explain that the change of wind dilute ability for air pollution does ex ert obvious influence on tendency of hazes.