Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 25, issue 22
Articles | Volume 25, issue 22
https://doi.org/10.5194/acp-25-16009-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/acp-25-16009-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 25, issue 22
Research article
 | 
18 Nov 2025
Research article |  | 18 Nov 2025

Urban ozone trends in Europe and the USA (2000–2021)

Beth S. Nelson and Will S. Drysdale

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Short summary
Urban O3 trends across Europe and the USA were explored between 2000–2021. Most warm season trends in high O3 in Europe were shown to be decreasing, though low values in both warm and cold seasons were increasing. Trends in the USA were similar, but showed less increasing trends low O3 in the warm season. Sites with similar trends were grouped, more different were seen in the USA, and identified ones where trends in high O3 values had started to increase later in the period.
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