Abstract：Objective To understand the temporal and spatial characteristics of air pollutants in Ningbo. Methods The air quality index （AQI） data of Ningbo in 2016 was used to study the temporal and spatial variations of air pollutants,including SO2,NO2,PM10,CO,O3-8H,PM2.5. Results AQIs in 310 days were less than or equal to 100,and AQIs in the other 56 days were greater than 100. The levels of NO2 and PM2.5 were higher than National Ambient Air Quality Standard Class II,and those of SO2,PM10,CO,O3-8H meted Class II. PM2.5 was the primary air pollutant in Ningbo. The seasonal variation of air pollutant concentration was obvious. The concentrations of SO2,NO2,PM10,CO,PM2.5 were high in January and December and low in July,August and September. The concentrations of O3-8H were high in May,and low in December. In terms of spatial heterogeneity,the concentrations of air pollutants were generally higher in north and lower in south,but the specific distributions of different pollutants were different. Conclusion Air pollution is still a critical issue in Ningbo. The concentrations of air pollutants in the north are generally higher than that in the south,and change with seasonal characteristics.
