Natacha S. Represa This email address is being protected from spambots. You need JavaScript enabled to view it.1, Lara S. Della Ceca1, Gabriela Abril2, María F. García Ferreyra1, Carlos M. Scavuzzo1 

1 Instituto de Altos Estudios Espaciales Mario Gulich (IG), Comisión Nacional de Actividades Espaciales (CONAE), Ruta C45. Km 8. CP 5187 - Falda del Cañete, Córdoba, Argentina
2 Autoridad de Cuenca Matanza Riachuelo (ACUMAR). Esmeralda 255, CP C1035ABE - Ciudad Autónoma de Buenos Aires, Argentina


Received: July 31, 2020
Revised: October 2, 2020
Accepted: November 16, 2020

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.


Download Citation: ||https://doi.org/10.4209/aaqr.2020.07.0486  


Cite this article:

Represa, N.S., Della Ceca, L.S., Abril, G., García Ferreyra, M.F., Scavuzzo, C.M. (2020). Atmospheric Pollutants Assessment during the COVID-19 Lockdown Using Remote Sensing and Ground-based Measurements in Buenos Aires, Argentina. Aerosol Air Qual. Res. https://doi.org/10.4209/aaqr.2020.07.0486


 

ABSTRACT


The COVID-19 outbreak measures of lockdown have generated exceptional urban behavior conditions allowing the analysis of a unique scenario. We examined the atmospheric emissions in Buenos Aires, Argentina, based on urban and industrial continuous monitoring of NO2, PM10 and PM2.5, and NO2 (TROPOMI/Sentinel-5p) and AOD (MAIAC/MODIS, Aqua) satellite products, in addition with meteorological data. We considered the time intervals before and after the announcement of lockdown, including the same periods for 2019. The results showed that NO2 and PM10 concentrations fell by ~30% and 44%, respectively, at urban stations during lockdown compared to 2019. An increase in PM at the industrial station (64% PM2.5 and 8% PM10) could be due to the contribution of industrial sources other than vehicle traffic. Also, we observed a reduction of the tropospheric NO2 column density mean by 54 % at urban stations, and AOD values decreased between 38 and 66 % during 2020. Concerning the spatial distribution, the tropospheric NO2 column showed a significant reduction of NO2 for the monthly mean in the metropolitan area at lockdown. Similarly, the AOD highest values had a greater extension for 2020 during the pre-lockdown monthly period. After the strict lockdown, concentration values increased steadily, particularly in ground-based measurements. Therefore, we were able to demonstrate the complementarity of ground-based and satellite data measurements of NO2 and aerosol to identify the effects of lockdown measures on the spatial and temporal variability of pollutants.


Keywords: COVID-19, Air quality, Lockdown, Remote sensing, Ground-based monitoring.




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