Air quality has been associated with human health and with issues related to the climate, water, agriculture, and the economy across the world. NO₂ is one of the main pollutants in the atmosphere; therefore, it is essential to analyze the quantitative changes and spatial distribution of NO₂. The spatiotemporal changes in the vertical column densities and related influencing factors of tropospheric NO₂ over Lanzhou for the period 2009–2018 were analyzed using remote sensing inversion data from the Ozone Monitoring Instrument and methods such as coefficient of variation, trend analysis, Hurst index, and risk analysis of NO₂ population exposure. Results indicate that the concentration of the tropospheric NO₂ column shows an overall upward trend from 2009 to 2018, and that the four-year mean distribution of seasonal tropospheric NO₂ vertical column densities is winter > autumn > spring > summer. A combination of topographic characteristics and an analysis of meteorological factors aid the NO₂ column in Lanzhou to be “high in winter and low in summer” and the analysis of socioeconomic factors reveals that car ownership makes a marked contribution to the concentration of the NO₂ column in Lanzhou. Furthermore, the coefficient of variation, trend analysis, Hurst index, and NO₂ population exposure risk analysis suggests that, in the Lanzhou area, overall NO₂ concentrations are relatively stable, with a small fluctuation range and slow growth trend. Future projections show the vertical NO₂ column densities in the research area undergoing a downward trend while the population density remains high.

空气质量与人类健康以及与全球气候，水，农业和经济有关的问题都有关系。NO ₂是大气中的主要污染物之一；因此，分析NO ₂的定量变化和空间分布至关重要。利用臭氧监测仪的遥感反演数据和变异系数，趋势分析，赫斯特指数，方法等方法，分析了2009-2018年兰州对流层NO ₂垂直柱密度的时空变化及相关影响因素。和NO ₂人群暴露风险分析。结果表明，对流层NO ₂的浓度纵列显示了从2009年到2018年的整体上升趋势，并且季节性对流层NO ₂垂直纵列密度的四年平均分布是冬天>秋天>春天>夏天。结合地形特征和气象因素分析，兰州的NO ₂柱“冬高夏低”，社会经济因素分析表明，拥有汽车对NO ₂的浓度有显着贡献。兰州专栏。此外，变异系数，趋势分析，Hurst指数和NO ₂人群暴露风险分析表明，兰州地区总体NO ₂浓度相对稳定，波动范围小，增长趋势缓慢。未来的预测表明研究区域中的垂直NO ₂柱密度正在呈下降趋势，而人口密度仍然很高。