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Ozone episode

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A period of usually a few days up to 2-3 weeks with high ozone concentrations, characterised by daily exceedances of the thresholds set to protect human health. Ozone episodes occur under specific meteorological conditions characterised by large stagnant areas of high pressure. Since the formation of ozone requires sunlight, ozone episodes mainly occur during summer.

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European Environment Agency (EEA)
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Denmark
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