This study investigates the relationship between territorial human influence and decreases in NO_{2} air pollution during a total COVID-19 lockdown in Metropolitan France. NO_{2} data from the confinement period and the Human Influence Index (HII) were implemented to address the problem. The relative change in tropospheric NO_{2} was calculated using Sentinel-5P (TROPOMI) satellite data. Hotspot-Coldspot analysis was performed to examine the change in NO_{2}. Moreover, the novel Human-Influenced Air Pollution Decrease Index (HIAPDI) was developed. Weather bias was investigated by implementing homogeneity analysis with χ^{2} test. The correlations between variables were tested with the statistical T-test. Likewise, remote observations were validated with data from in-situ monitoring stations. The study showed a strong correlation between the NO_{2} decrease during April 2020 under confinement measures and HII. The greater the anthropogenic influence, the greater the reduction of NO_{2} in the regions (R^{2} = 0.62). The new HIAPDI evidenced the degree of anthropogenic impact on NO_{2} change. HIAPDI was found to be a reliable measure to determine the correlation between human influence and change in air pollution (R^{2} = 0.93). It is concluded that the anthropogenic influence is a determining factor in the phenomenon of near-surface NO_{2} reduction. The implementation of HIAPDI is recommended in the analysis of other polluting gases.
【저자키워드】 confinement, Air pollution, Anthropogenic influence, HIAPDI, NO(2) decrease.,