Preprints
https://doi.org/10.5194/egusphere-2024-3553
https://doi.org/10.5194/egusphere-2024-3553
10 Feb 2025
 | 10 Feb 2025

On-road vehicle emission measurements show a significant reduction of black carbon and nitrogen oxides emissions in Euro6c and 6d diesel-powered cars

Irena Ježek Brecelj, Asta Gregorič, Lucijan Zgonik, Tjaša Rutar, Matic Ivančič, Balint Alfoldy, Griša Močnik, and Martin Rigler

Abstract. This study compares the results of three on-road chasing campaigns conducted in 2011, 2017, and 2023, making it the first to report how real-world emission factors (EF) for diesel vehicles have changed over a decade. By directly measuring emissions during real-world driving, this research provides critical insights into the effectiveness of emission control technologies and regulatory interventions. The findings highlight the transformative impact of Diesel Particulate Filters (DPFs), which have consistently reduced black carbon (BC) EF from diesel vehicles to levels comparable to gasoline-powered cars. This underscores the success of DPFs in controlling particulate emissions, a major contributor to air quality issues. Real Driving Emissions (RDE) regulations have also proven effective in significantly lowering nitrogen oxide (NOx) emissions. By incentivizing the use of previously underutilized technologies, these regulations ensure better compliance with standards during typical driving conditions. Real-world EF measurements are crucial for bridging the gap between ambient pollution data and traffic emission models, enabling more accurate assessments of vehicle fleet contributions to air quality. This study employs an independent chasing method, demonstrating its value as a practical tool for monitoring fleet emissions, identifying super-emitters, and detecting vehicles with defeat devices. Overall, this decade-long analysis highlights the significant advancements in reducing diesel emissions, while emphasizing the importance of sustained efforts in monitoring and regulation to further improve air quality and refine emission modeling frameworks.

Competing interests: The authors Irena Ježek Brecelj, Asta Gregorič, Matic Ivančič, Balint Alfoldy, Griša Močnik, and Martin Rigler were employed by Aerosol d.o.o., the manufacturer of Aethalometers, at the time or part of the time while the study was conducted.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this paper. While Copernicus Publications makes every effort to include appropriate place names, the final responsibility lies with the authors. Views expressed in the text are those of the authors and do not necessarily reflect the views of the publisher.
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Journal article(s) based on this preprint

21 Aug 2025
On-road vehicle emissions measurements show a significant reduction in black carbon and nitrogen oxide emissions in Euro 6c and 6d diesel-powered cars
Irena Ježek Brecelj, Asta Gregorič, Lucijan Zgonik, Tjaša Rutar, Matic Ivančič, Bálint Alföldy, Griša Močnik, and Martin Rigler
Atmos. Chem. Phys., 25, 9113–9125, https://doi.org/10.5194/acp-25-9113-2025,https://doi.org/10.5194/acp-25-9113-2025, 2025
Short summary
Irena Ježek Brecelj, Asta Gregorič, Lucijan Zgonik, Tjaša Rutar, Matic Ivančič, Balint Alfoldy, Griša Močnik, and Martin Rigler

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-3553', Anonymous Referee #1, 28 Mar 2025
    • AC1: 'Reply on RC1', Irena Ježek Brecelj, 09 May 2025
  • RC2: 'Comment on egusphere-2024-3553', Anonymous Referee #2, 28 Mar 2025
    • AC2: 'Reply on RC2', Irena Ježek Brecelj, 09 May 2025

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-3553', Anonymous Referee #1, 28 Mar 2025
    • AC1: 'Reply on RC1', Irena Ježek Brecelj, 09 May 2025
  • RC2: 'Comment on egusphere-2024-3553', Anonymous Referee #2, 28 Mar 2025
    • AC2: 'Reply on RC2', Irena Ježek Brecelj, 09 May 2025

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
AR by Irena Ježek Brecelj on behalf of the Authors (09 May 2025)  Author's response   Author's tracked changes   Manuscript 
ED: Referee Nomination & Report Request started (09 May 2025) by James Allan
RR by Anonymous Referee #2 (12 May 2025)
ED: Publish subject to minor revisions (review by editor) (15 May 2025) by James Allan
AR by Irena Ježek Brecelj on behalf of the Authors (21 May 2025)  Author's response   Author's tracked changes   Manuscript 
ED: Publish as is (30 May 2025) by James Allan
AR by Irena Ježek Brecelj on behalf of the Authors (04 Jun 2025)  Author's response   Manuscript 

Journal article(s) based on this preprint

21 Aug 2025
On-road vehicle emissions measurements show a significant reduction in black carbon and nitrogen oxide emissions in Euro 6c and 6d diesel-powered cars
Irena Ježek Brecelj, Asta Gregorič, Lucijan Zgonik, Tjaša Rutar, Matic Ivančič, Bálint Alföldy, Griša Močnik, and Martin Rigler
Atmos. Chem. Phys., 25, 9113–9125, https://doi.org/10.5194/acp-25-9113-2025,https://doi.org/10.5194/acp-25-9113-2025, 2025
Short summary
Irena Ježek Brecelj, Asta Gregorič, Lucijan Zgonik, Tjaša Rutar, Matic Ivančič, Balint Alfoldy, Griša Močnik, and Martin Rigler
Irena Ježek Brecelj, Asta Gregorič, Lucijan Zgonik, Tjaša Rutar, Matic Ivančič, Balint Alfoldy, Griša Močnik, and Martin Rigler

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The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.

Short summary
Following a major car industry scandal involving diesel emissions tests, Europe introduced new testing procedures. However, concerns remained about their effectiveness. Our independent study examined real-world vehicle emissions and revealed encouraging findings: modern diesel cars perform as well as, or even better than, gasoline cars in terms of nitrogen oxides emissions. We found the same pattern for soot particles, challenging common perceptions about diesel's environmental impact.
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