Formation of ozone
Ground-level ozone or 'bad' ozone is formed when nitrogen oxides (NOx) and volatile organic compounds (VOC), collectively called 'ozone precursors', react with sunlight. Emissions from car exhausts, power plants and industrial facilities are the major sources of NOx and VOC.
For references, please go to www.eea.europa.eu/soer or scan the QR code.
This briefing is part of the EEA's report The European Environment - State and Outlook 2015. The EEA is an official agency of the EU, tasked with providing information on Europe's environment.
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