Articles | Volume 22, issue 11
Atmos. Chem. Phys., 22, 7105–7129, 2022
https://doi.org/10.5194/acp-22-7105-2022
Atmos. Chem. Phys., 22, 7105–7129, 2022
https://doi.org/10.5194/acp-22-7105-2022
Research article
02 Jun 2022
Research article | 02 Jun 2022

Secondary PM2.5 decreases significantly less than NO2 emission reductions during COVID lockdown in Germany

Vigneshkumar Balamurugan et al.

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Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-87', Anonymous Referee #1, 02 Mar 2022
    • AC1: 'Reply on RC1', Vigneshkumar Balamurugan, 15 Apr 2022
  • RC2: 'Comment on acp-2022-87', Anonymous Referee #2, 14 Mar 2022
    • AC2: 'Reply on RC2', Vigneshkumar Balamurugan, 15 Apr 2022
  • RC3: 'Comment on acp-2022-87', Anonymous Referee #3, 17 Mar 2022
    • AC3: 'Reply on RC3', Vigneshkumar Balamurugan, 15 Apr 2022

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision
AR by Vigneshkumar Balamurugan on behalf of the Authors (15 Apr 2022)  Author's response    Author's tracked changes    Manuscript
ED: Referee Nomination & Report Request started (19 Apr 2022) by Theodora Nah
RR by Anonymous Referee #1 (20 Apr 2022)
RR by Anonymous Referee #2 (30 Apr 2022)
RR by Anonymous Referee #3 (09 May 2022)
ED: Publish as is (10 May 2022) by Theodora Nah
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Short summary
In this study, we investigated the response of secondary pollutants to changes in precursor emissions, focusing on the formation of secondary PM, during the COVID-19 lockdown period. We show that, due to the decrease in primary NOx emissions, atmospheric oxidizing capacity is increased. The nighttime increase in ozone, caused by less NO titration, results in higher NO3 radicals, which contribute significantly to the formation of PM nitrates. O3 should be limited in order to control PM pollution.
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