Articles | Volume 21, issue 10
Atmos. Chem. Phys., 21, 7597–7609, 2021
https://doi.org/10.5194/acp-21-7597-2021
Atmos. Chem. Phys., 21, 7597–7609, 2021
https://doi.org/10.5194/acp-21-7597-2021

Research article 19 May 2021

Research article | 19 May 2021

Impacts of the COVID-19 lockdown on air pollution at regional and urban background sites in northern Italy

Jean-Philippe Putaud et al.

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Latest update: 23 Sep 2021
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Short summary
To determine the impact of the COVID lockdown on air quality in northern Italy, measurements of atmospheric pollutants (NO2, PM10, O3, NO, SO2 ) were compared to the output of a model ignoring the lockdown. We found that NO2 decreased on average by −30 % to −40 %. Unlike NO2, PM10 was not significantly affected due to the compensation of decreased emissions from traffic by increased emissions from domestic heating and/or by changes in atmospheric chemistry enhancing secondary aerosol formation.
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