Aerosol microphysics and chemistry reveal the COVID19 lockdown impact on urban air quality

Air quality in urban areas and megacities is dependent on emissions, physicochemical process and atmospheric conditions in a complex manner. The impact on air quality metrics of the COVID-19 lockdown measures was evaluated during two periods in Athens, Greece. The first period involved stoppage of e...

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Published in:Scientific reports 2021-07, Vol.11 (1), p.14477-14477, Article 14477
Main Authors: Eleftheriadis, Konstantinos, Gini, Maria I., Diapouli, Evangelia, Vratolis, Stergios, Vasilatou, Vasiliki, Fetfatzis, Prodromos, Manousakas, Manousos I.
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Language:English
Subjects:
704/106
704/106/35/823
704/106/35/824
704/172
704/172/169
704/172/4081
Aerosols
Aging
Air pollution
Air quality
Air quality measurements
Atmospheric conditions
Burning
COVID-19
Emissions
Fossil fuels
Growth rate
Humanities and Social Sciences
Megacities
Migratory species
multidisciplinary
Outdoor air quality
Science
Science (multidisciplinary)
Urban areas
Vehicle emissions
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description Air quality in urban areas and megacities is dependent on emissions, physicochemical process and atmospheric conditions in a complex manner. The impact on air quality metrics of the COVID-19 lockdown measures was evaluated during two periods in Athens, Greece. The first period involved stoppage of educational and recreational activities and the second severe restrictions to all but necessary transport and workplace activities. Fresh traffic emissions and their aerosol products in terms of ultrafine nuclei particles and nitrates showed the most significant reduction especially during the 2nd period (40–50%). Carbonaceous aerosol both from fossil fuel emissions and biomass burning, as well as aging ultrafine and accumulation mode particles showed an increase of 10–20% of average before showing a decline (5 to 30%). It is found that removal of small nuclei and Aitken modes increased growth rates and migration of condensable species to larger particles maintaining aerosol volume.
doi_str_mv 10.1038/s41598-021-93650-6
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subjects 704/106
704/106/35/823
704/106/35/824
704/172
704/172/169
704/172/4081
Aerosols
Aging
Air pollution
Air quality
Air quality measurements
Atmospheric conditions
Burning
COVID-19
Emissions
Fossil fuels
Growth rate
Humanities and Social Sciences
Megacities
Migratory species
multidisciplinary
Outdoor air quality
Science
Science (multidisciplinary)
Urban areas
Vehicle emissions
title Aerosol microphysics and chemistry reveal the COVID19 lockdown impact on urban air quality
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