The implementation of Directive 92/72/EEC has led to the installation of stations measuring ozone increasing. The directive calls for particular stations to be placed in sites where the risk of approaching or exceeding the information threshold or alert is the highest. Ozone concentrations are highest in summer meet, due to more intense sunlight. From April to August 2005, the frequency of exceedances is comparable to previous years. The maximum time was reached in Portugal (361 ug/m3). Hourly averages between 300 and 360 μg/m3 were registered in France, Greece, Italy and Spain. The alert threshold of 240 μg/m3 as an hourly average was exceeded for 127 hours in nine countries (Austria Belgium, France, Germany, Greece, Italy, Netherlands, Portugal and Spain).
The alert threshold of 240 μg/m3 as an hourly average was exceeded for 127 hours in nine countries (Austria, Belgium, France, Germany, Greece, Italy, Netherlands, Portugal and Spain). The information threshold of population of 180 microgramme/m3 average time has been exceeded during the summer of 2005 in all member states of the EU except in Cyprus, Denmark, Finland, Ireland, Latvia, Lithuania and Sweden. Thus, 3 056 exceedances of information have been observed in 794 stations from a total of 1 865. In the other Member States, the number of days with at least one exceedance was observed during summer 2005 ranged from 1 in Estonia to 86 in Italy. He was 54 in France. Across the European Union, 794 stations (42%) experienced at least one exceedance (against 36% in 2001 and 25% in 2000).
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