Air pollution by ozone across Europe during summer 2010: overview of exceedances of EC ozone threshold values for April–September 2010
Despite efforts to mitigate ozone pollution, the number of exceedances of EU ground-level ozone concentration standards for protecting human health (Directive 2008/50/EC) remained at sustained levels during summer 2010 (1).
In 2010, the threshold of 120 μg/m3 maximum daily eight-hour mean was exceeded on more than 25 days in a significant part of Europe. This is the threshold that will be used to assess whether countries meet the target value for protecting human health (2). Exceedances of this threshold occurred in 17 EU Member States (Austria, Bulgaria, Cyprus, the Czech Republic, France, Germany, Greece, Hungary, Italy, Luxembourg, Malta, Poland, Portugal, Romania, the Slovak Republic, Slovenia and Spain) and four other countries (Croatia, the former Yugoslav Republic of Macedonia, Switzerland and Turkey). As in previous years, the most widespread concentrations occurred in the Mediterranean area. However, western and central Europe were affected more than in 2009.
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