Abstract: Accurate prediction of the temporal and spatial variation trend of atmospheric pollutant concentration is the key for formulating and revising air pollution prevention and control measures and continuously improving air quality.In this paper,Hohhot, Inner Mongolia was taken as the study area.Based on the monthly data of the urban environmental air quality automatic monitoring station from 2015 to 2020, the Prophet model was used to study and determine the mutation point of environmental monitoring data,the upper and lower limits of Prophet model saturation prediction,and other characteristics. The concentration prediction of five pollutants PM_2.5, PM₁₀, NO₂, SO₂ and O₃ in the study area during the 14th Five-Year Plan period was completed.The accuracy of the prediction model was evaluated by the determination coefficient,the Root mean square error and average deviation error,and the temporal and spatial variation of each pollutant concentration in 2025 was analyzed.The results showed that the Prophet model could accurately predict the concentration of five pollutants.It was estimated that in 2025,the concentration of PM_2.5, PM₁₀, NO₂, SO₂ and O₃ in Hohhot will be 41.64, 71.71, 36.85, 21.66 and 123.24 μg/m³ respectively.In the future,the annual concentration of PM_2.5, PM₁₀, NO₂ and SO₂ in Hohhot will show a "U" type distribution,with the characteristics of high in winter and low in summer.The annual concentration of O₃ will show a "Λ" type distribution,with the characteristics of high in summer and low in winter.In the future,the pollution in the western part of Hohhot will be heavier than in the eastern part.The forecast results showed that the current air pollution control measures in this prefecture-level city provide a guarantee for the continuous improvement of air pollution, O₃ pollution has a trend of aggravation but is still within the controllable range,and further prevention and control measures are needed. This paper revealed in detail the concentration and temporal and spatial variation trends of five air pollutants in Hohhot during the 14th Five-Year Plan period, which could provide data for the continuous improvement of air quality in Hohhot.