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• 10:21, 28 July 2023 USEV talk contribs created page O3 (Created page with "=== '''Definition''' === Ozone (O3) is a secondary pollutant formed from a complex series of chemical reactions of primary precursor pollutants, mainly NOx and VOCs, in the presence of solar radiation. Ozone has a positive effect in the stratosphere, where it forms the so-called ozone layer, as it protects against ultraviolet radiation. However, in the troposphere it becomes a pollutant that acts as a powerful and aggressive oxidising agent. === '''Predominant sources...")