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Formation of ozone

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Last modified : Jun 26, 2007 10:46 PM

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Ground-level ozone or 'bad' ozone is formed when nitrogen oxides (NO_x) 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 NO_x and VOC.

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Air pollution data centre

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