Abstract: Jinan is one of the cities with the most severe fog and haze in China. It is of great significance to explore the spatial and temporal distribution of air pollution and its impact mechanism in this area. Geostatistical interpolation is used to analyze the spatial and temporal distribution characteristics of AQI in the main urban area of Jinan, and the risk factors and influencing mechanism of AQI are quantitatively analyzed by using geographic detector. The results show that, on the interannual scale, the AQI in the main urban area of Jinan city decreases year by year in time, and generally presents the distribution trend of low southeast and high northwest in space. On the seasonal scale, the AQI in the main urban area of Jinan has distinct seasonal differences in time. The order from high to low is winter, spring, autumn and summer. Spatially, the AQI in the main urban area of Jinan presents a distribution pattern of high in spring and winter, low in southeast and north, low in summer, low in south and high in north in autumn. On the monthly scale, AQI in the main urban area of Jinan city presents typical “U” distribution characteristics, with the highest value in January and December and the lowest value in August. The influence of each factor interaction is far greater than that of single factor. Among them, the interaction of land use type annual average precipitation has the greatest influence on AQI in the main urban area of Jinan. The study shows that AQI in the main urban area of Jinan is most affected by land use types and annual average precipitation.

Key words: air quality index, AQI, spatial and temporal distribution, geographic detector, influence mechanism