NDLI: Assessing the Impact of Corona-Virus-19 on Nitrogen Dioxide Levels over Southern Ontario, Canada

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Assessing the Impact of Corona-Virus-19 on Nitrogen Dioxide Levels over Southern Ontario, Canada

Content Provider	MDPI
Author	Griffin, Debora McLinden, Chris Racine, Jacinthe Moran, Michael Fioletov, Vitali Pavlovic, Radenko Mashayekhi, Rabab Zhao, Xiaoyi Eskes, Henk
Copyright Year	2020
Abstract	A lockdown was implemented in Canada mid-March 2020 to limit the spread of COVID-19. In the wake of this lockdown, declines in nitrogen dioxide (NO $_{2}$ ) were observed from the TROPOspheric Monitoring Instrument (TROPOMI). A method is presented to quantify how much of this decrease is due to the lockdown itself as opposed to variability in meteorology and satellite sampling. The operational air quality forecast model, GEM-MACH (Global Environmental Multi-scale - Modelling Air quality and CHemistry), was used together with TROPOMI to determine expected NO $_{2}$ columns that represents what TROPOMI would have observed for a non-COVID scenario. Applying this methodology to southern Ontario, decreases in NO $_{2}$ emissions due to the lockdown were seen, with an average $40 %$ (roughly 10 kt[NO $_{2}$ ]/yr) in Toronto and Mississauga and even larger declines in the city center. Natural and satellite sampling variability accounted for as much as 20–30%, which demonstrates the importance of taking meteorology into account. A model run with reduced emissions (from 65 kt[NO $_{2}$ ]/yr to 40 kt[NO $_{2}$ ]/yr in the Greater Toronto Area) based on emission activity data during the lockdown period was found to be consistent with TROPOMI NO $_{2}$ columns.
Starting Page	4112
e-ISSN	20724292
DOI	10.3390/rs12244112
Journal	Remote Sensing
Issue Number	24
Volume Number	12
Language	English
Publisher	MDPI
Publisher Date	2020-12-16
Access Restriction	Open
Subject Keyword	Remote Sensing Environmental Engineering Air Pollution Tropomi Covid Nitrogen Oxides
Content Type	Text
Resource Type	Article

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