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Uploaded on Tuesday 20 May 2014
Tropospheric Ozone (O3)
Tropospheric Ozone (O3) is a major air and climate pollutant. It causes warming and is a highly reactive oxidant, harmful to crop production and human health. O3 is known as a `secondary´ pollutant because it is not emitted directly, but instead forms when precursor gases react in the presence of sunlight.