| 6 | The spatial dynamics of Ukraine air quality impacted by the war and pandemic显示文摘In recent years,our world has experienced significant disruptions due to the COviD-19 pandemic,and Russia's 2022 invasion of Ukraine,impacting human activities and the global environment.This paper explored air quality changes in Ukraine due to COVID-19,and Russia's invasion of Ukraine using on-demand with a what-you-see-is-what-you-get approach.During the cOVID-19 pandemic,strict quarantine policies in Ukraine led to a 2%reduction in tropospheric NO_(2) concentration before the lockdown and 4%during the lockdown period.Cities like Kyiv,Donetsk,and Dnipro exhibited reductions of 5%,11%,and 16%,respectively.Total SO_(2) column concentration decreased by 6%before the lockdown and 2.5%during the lockdown period,except in high population density areas.Kyiv showed the highest reduction of 17%in SO_(2) concentration,while Donetsk and Dnipro exhibited an 11%reduction.However,during the Russian invasion,there was a significant increase in tropospheric NO_(2) concentration in heavily destroyed Kharkiv while most eastern regions experienced a reduction.The total SO_(2) column was 48%higher before the war but reduced throughout the country after the war,except for in Kyiv and a few central regions.These findings can contribute to analyzing air pollution and building digital twin simulations for future reconstruction scenarios. | vizhi Qian Liu Theodore S.Trefonidesc Sina Hasheminassab Jennifer Smith Thomas Huang Kevin M.Marlis Joe T.Roberts Zifu Wang Dexuan Sha Ana Beatriz Moura Pereira Heramb Podar Jacob Cain Chaowei Yang | 2023 | International Journal of Digital Earth2023，16，1： | 0 |
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