O3 - Average number of days for selected European cities
Average number of days in the year where O3 concentrations exceeds 120 µg/m3, figures are shown at city level.
For references, please go to www.eea.europa.eu/soer or scan the QR code.
This briefing is part of the EEA's report The European Environment - State and Outlook 2015. The EEA is an official agency of the EU, tasked with providing information on Europe’s environment.
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