Preprints
https://doi.org/10.5194/egusphere-2025-1423
https://doi.org/10.5194/egusphere-2025-1423
19 Jun 2025
 | 19 Jun 2025

Measured and modelled air quality related effects of a noise barrier near a busy highway

Sami Daniel Harni, Lasse Johansson, Jarkko Ville Niemi, Ville Silvonen, Juan Andrés Casquero-Vera, Anu Kousa, Krista Luoma, Viet Le, David Brus, Konstantinos Doulgeris, Topi Rönkkö, Hanna Manninen, Tuukka Petäjä, and Hilkka Timonen

Abstract. A three-month air quality measurement campaign was conducted in spring 2023 near a busy highway in Espoo, Finland. The measurement site featured a high (6.5 m) noise barrier built adjacent to the highway. Additionally, there was a gap in the noise barrier at the selected measurement site, providing an opportunity to study the air quality impacts of the noise barrier. Several air quality measurement devices were installed behind the noise barrier and in the gap at distances of 10, 20 and 40 m from the side of the highway. Additionally, 15 passive samplers were deployed to monitor NO2 concentrations across the study area, mobile measurements were conducted using the ATMo-Lab mobile laboratory on the highway and concurrent flights with drones equipped with AQ monitors were performed along the highway.

The effects of the noise barrier on PM10, PM2.5, lung deposited surface area (LDSA), particle number concentration (PNC), NO2, and black carbon (BC) were quantified based on analysed measurement data. Furthermore, the measurements were compared with simulated pollutant concentrations from a local scale Gaussian air quality model (Enfuser) with a nearby obstacle detection and concentration reduction method incorporated in the model to address the effects of the noise barrier in the study.

The noise barrier was found to effectively reduce pollutant concentrations behind the barrier. The most significant reductions were observed closest to the highway. The greatest reductions were observed for PM10 (mostly road dust) while gaseous concentrations, such as NO2, exhibited less pronounced decreases.

Competing interests: At least one of the (co-)authors is a member of the editorial board of Atmospheric Chemistry and Physics.

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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Sami Daniel Harni, Lasse Johansson, Jarkko Ville Niemi, Ville Silvonen, Juan Andrés Casquero-Vera, Anu Kousa, Krista Luoma, Viet Le, David Brus, Konstantinos Doulgeris, Topi Rönkkö, Hanna Manninen, Tuukka Petäjä, and Hilkka Timonen

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2025-1423', Anonymous Referee #2, 09 Jul 2025
  • RC2: 'Comment on egusphere-2025-1423', Anonymous Referee #1, 04 Aug 2025
  • AC1: 'Comment on egusphere-2025-1423', Sami Harni, 03 Sep 2025
Sami Daniel Harni, Lasse Johansson, Jarkko Ville Niemi, Ville Silvonen, Juan Andrés Casquero-Vera, Anu Kousa, Krista Luoma, Viet Le, David Brus, Konstantinos Doulgeris, Topi Rönkkö, Hanna Manninen, Tuukka Petäjä, and Hilkka Timonen
Sami Daniel Harni, Lasse Johansson, Jarkko Ville Niemi, Ville Silvonen, Juan Andrés Casquero-Vera, Anu Kousa, Krista Luoma, Viet Le, David Brus, Konstantinos Doulgeris, Topi Rönkkö, Hanna Manninen, Tuukka Petäjä, and Hilkka Timonen

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Short summary
The 3-month measurement campaign at Espoo, Finland, in spring 2023. The measurement campaign studied the effect of the noise barrier on pollutant concentration gradients on one side of a major highway. The studied pollutants included PM10, PM2.5, lung deposited surface area (LDSA), particle number concentration (PNC), NO2, and black carbon (BC). The noise barrier was found to be effective in reducing, especially the concentration of particulate pollutants.
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