Abstract: Based on the surface meteorological data at 97 stations of Hunan Province during 1961-2006, climatic characteristics of the weather phenomenon of haze were analyzed. Results show that, since the 1970s, haze days has increased quickly, its extremum has been renewed more frequently, the intensity of haze is strengthening and the area of heavy haze is widening. In the last 46 years, the annual average wind speed in Hunan Province declined linearly, the yearly total rain days decreased wavely, the days with relative humidity ≤ 70% increased. Climate change, speed up of urbanization and the increase in air pollutant are likely the basic causes of more haze phenomena.

Key words: haze, climate change, pollution, urbanization