Number of days on which at least one exceedance of the 1-hour threshold value was observed per country and per month during summer 2004
Bottom: Alert threshold exceedances.
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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