Ground level ozone is an air pollutant which is formed by the chemical reactions between oxides of nitrogen (NOx) and volatile organic compounds (VOC), in the presence of strong sunlight. It has a global background concentration, which also has natural sources. Ground level ozone pollution episodes are infrequent in Ireland but may occur when we have unusually hot, dry and stable weather conditions. These episodes may also be triggered by pollution episodes in the rest of Europe, because depending on weather conditions, ground level ozone pollution may be transported across to Ireland from mainland Europe.
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