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Inhalable particles(particulate matter with aerodynamic diameter < 10 um,PM10),especially fine particles(particulate matter with aerodynamic diameter < 2.5 um,PM2.5),have become the primary air pollutants in Beijing,seriously affecting the visibility of the city,the quality of the urban environment and the health of local residents.To monitor the spatial and temporal variability of fine particles concentration in urban Beijing in recent years,we studied the interannual variability and the spatial distribution of fine particulate matter,as well as the influence of different functional areas on fine particulate matter.