Abstract: Using the daily meteorological observation data of the Shapingba station in the Chongqing metropolitan area for2002 ~ 2014 years, the data of meteorological observation and pollution monitoring from October to March, The relationship between the concentration changes of SO₂, NO₂ and PM10 in different grades of fog and haze and the relationship with air temperature, wind and precipitation were studied. The results show that there were 27 different stages of fog and haze weather process from grade Ⅰ to IV in Chongqing metropolitan area in the 2009 ~ 2011 year. Among them, the concentration of SO₂ was a single peak, the peak appeared at noon, the concentration of the day was greater than the night, the concentration of NO₂ was a double peak curve, the main peak value appeared at 20 at night, and the secondary peak appeared at 12 noon. The daily variation range of PM10 is smaller than that of SO₂ and NO₂. The correlation between the concentration of pollutants and the temperature and relative humidity is better. The static wind are not beneficial to the dilution and diffusion of pollutants, and the precipitation has a clearer clearance effect on the pollutants.