Measurement report: 30 years of BTEX monitoring  at a suburban site in Switzerland supported by  additional urban VOC observations

Le Bras, Zoé; Rubli, Pascal; Hueglin, Christoph; Reimann, Stefan

doi:10.5194/acp-26-869-2026

Articles | Volume 26, issue 2

https://doi.org/10.5194/acp-26-869-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-26-869-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 26, issue 2

Measurement report

|

20 Jan 2026

Measurement report |

| 20 Jan 2026

Measurement report: 30 years of BTEX monitoring at a suburban site in Switzerland supported by additional urban VOC observations

Zoé Le Bras, Pascal Rubli, Christoph Hueglin, and Stefan Reimann

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Cumulative views and downloads (calculated since 25 Aug 2025)

Month	HTML	PDF	XML	Total
Aug 2025	2,036	30	6	2,072
Sep 2025	2,972	26	14	3,012
Oct 2025	142	32	16	190
Nov 2025	102	46	12	160
Dec 2025	104	52	16	172
Jan 2026	444	123	23	590
Feb 2026	299	77	20	396
Mar 2026	121	72	19	212
Apr 2026	119	42	8	169
May 2026	3	1	0	4

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Since 1994, harmful air pollutants called BTEX (benzene, toluene, ethylbenzene and xylene) have declined by up to 89 % in the suburban area of Zurich thanks to the introduction of various air quality directives in Switzerland and in Europe. Although their contribution to ozone formation became less abundant, they still significantly contribute to the formation of airborne particles. While this study shows clear improvements in air quality, it also highlights the need for further efforts.