Remote Sensing, Volume 14, Issue 7
April-1 2022 - 241 articles
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Cover Story: This work shows changes in tropospheric and surface nitrogen dioxide (NO2) that were observed during first two years of the COVID-19 pandemic in the Greater Toronto Area, Canada. Meteorological and satellite data were used to facilitate the analysis and reveal detailed local emission changes from different areas of the City of Toronto. Ground-based remote sensing data show a clear reduction in NO2, especially in the more polluted downtown and airport areas (reductions from 35% to 40% in 2020 compared to 5-year mean value). Compared to the sharp decline in NO2 emissions in 2020, the atmospheric NO2 amounts in 2021 started to recover, but were still below the mean values of the pre-pandemic time. For some sites, the pre-pandemic NO2 peak caused by local morning rush hour had still not returned in 2021, indicating a change in local traffic and commuter patterns. View this paper. 
