Articles | Volume 21, issue 12
https://doi.org/10.5194/acp-21-9309-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-21-9309-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Non-linear response of PM2.5 to changes in NOx and NH3 emissions in the Po basin (Italy): consequences for air quality plans
Philippe Thunis
CORRESPONDING AUTHOR
European Commission, Joint Research Centre, Ispra, Italy
Alain Clappier
Université de Strasbourg, Laboratoire Image Ville Environnement, Strasbourg, France
Matthias Beekmann
Université de Paris and Université Paris-Est Créteil, CNRS, LISA, F-75013 Paris, France
Jean Philippe Putaud
European Commission, Joint Research Centre, Ispra, Italy
Cornelis Cuvelier
European Commission, Joint Research Centre, Ispra, Italy
retired
Jessie Madrazo
Signa Terre SA, Geneva, Switzerland
Alexander de Meij
MetClim, Varese, Italy
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Latest update: 16 Aug 2025
Short summary
Modelling simulations are used to identify the most efficient emission reduction strategies to reduce PM2.5 concentration levels in northern Italy. Results show contrasting chemical regimes and important non-linearities during wintertime, with the striking result that PM2.5 levels may increase when NOx reductions are applied in NOx-rich areas – a process that may have contributed to the absence of significant PM2.5 decrease during the COVID-19 lockdowns in many European cities.
Modelling simulations are used to identify the most efficient emission reduction strategies to...
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