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The threshold for ground level ozone is currently set at eight hours at a mean concentration of 110?3
Liechtenstein is not included due to a lack of data.
Coastal stations are marked by circles and ICES open-water stations (>20 km from coast) by squares
(a) the cold summer of 1956, (b) the average summer of 1991, and, (c) the hot summer of 2003
For references, please go to https://www.eea.europa.eu/portal_relations/eea-figure or scan the QR code.
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