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

• Austria
• Belgium
• Bosnia and Herzegovina
• Bulgaria
• Cyprus
• Czechia
• Denmark
• Estonia
• Finland
• France
• Germany
• Greece
• Hungary
• Ireland
• Italy
• Latvia
• Liechtenstein
• Lithuania
• Luxembourg
• Malta
• Netherlands
• Norway
• Poland
• Portugal
• Romania
• Slovakia
• Slovenia
• Spain
• Sweden
• Switzerland
• United Kingdom

Bottom: Alert threshold exceedances.