Authors:
Pedro Silva
;
Mariana Ávila
and
Márcia Gonçalves
Affiliation:
Earth Observation Laboratory, Atlantic International Research (AIR) Centre, TERINOV- Terra Chã, Angra do Heroísmo, Portugal
Keyword(s):
Earth Observation, Remote Sensing, Copernicus, Sentinel-3A, Sentinel-3B, Sentinel-5P, NO2, PM2.5, PM10, TSM.
Abstract:
COVID-19 pandemic forced many countries to adopt lockdown measures, temporarily closing factories, diminish maritime traffic and reducing the mobility of people in the cities. Analysis from the Tropospheric Monitoring Instrument (TROPOMI) and Ocean and Land Colour Instrument (OLCI) on board Europe’s Sentinel-5P, 3A/B respectively, for the first wave of the COVID-19, have shown a substantial improvement in air and water quality. More specifically, since COVID-19 lockdown until the end April, Lisbon and Porto were at their lowest PM10 levels of about 20% and a drop of 33% in 2 years, while Madrid had a significant drop since lockdown with vales significantly below 2018 levels but still close to 2019 levels. In terms of NO2 levels, Lisbon had an historical minimum of the last 2 years, dropping more than 40% during most of April 2020. Finally, Madrid had 2-year lowest level of more than 30% since lockdown. Concerning the water quality in the Portuguese coastal waters, it was verified an
increase in water transparency since confinement started until May, accordingly to the Total Suspended Matter (TSM) indicator. From February to March, March to April and April to May there was a reduction in TSM levels of 17%, 37% and 53% respectively.
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