| Citation: | GUO L H,YIN H M,YAN X,et al.Temporal and spatial distribution characteristics of atmospheric pollutants in urban area of Kunming City[J].Journal of Environmental Engineering Technology，2022，12（4）：992-997 doi: 10.12153/j.issn.1674-991X.20210208
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Based on the monitoring data of national control monitoring stations in the urban area of Kunming in 2013-2020, the temporal and spatial distribution features of atmospheric pollutants were analyzed. The results showed that during the period of 2013-2020, the annually-averaged concentration of O3 in the urban area of Kunming generally showed an upward trend, and the annually-averaged concentrations of other pollutants showed a downward trend. The annually-averaged concentration of O3 increased by 4.1%, while that of SO2 dropped by 67.9% and other pollutants dropped by 35.0%-55.0%. The proportion of days of primary pollutants exceeding Level 1 or above the standard of Ambient Air Quality Standards (GB 3095—2012 ) indicated that O3 instead of PM2.5 had become the primary atmospheric pollutant in Kunming. The highest concentration of O3 appeared in spring, followed by summer, and the lowest in autumn, the concentrations of PM10 and PM2.5 were generally high in spring and winter but low in autumn, and as for SO2, NO2 and CO, the highest concentrations appeared in winter and lowest in summer. But the variation ranges in four seasons of SO2 and NO2 were smaller than that of other pollutants. O3 in spring and summer and PM2.5 in spring and winter were the key points of air pollutants control in Kunming. The daily variation of O3 presented single peak distribution, CO, NO2, PM10 and PM2.5 presented double peaks distribution, but the variation of peak-valley of PM10 and PM2.5 concentrations were not distinct. The peaks of NO2, PM2.5, PM10 and CO were identical to morning rush hours, the peak of O3 usually appeared during 14:00-15:00, and the concentration of SO2 was higher in the morning than in the afternoon. As for spatial distribution patterns, remarkable distinctions existed for different pollutants. The concentrations of SO2, PM2.5, NO2, PM10 and CO of western stations were 54.5%, 20.0%, 17.9%, 14.6% and 2.4%, respectively higher than those of eastern stations. On the contrary, O3 concentrations in eastern stations were 9.0% higher than that of western stations. The difference of SO2, NO2 and O3 concentrations between eastern and western stations had narrowed down year by year, and this might be caused by the weakening of the impact of pollution transmission from Anning Industrial Park.
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