Many chemical reactions in the atmosphere are climatically relevant because they change concentrations of radiatively active gases or particles as well as could properties. Two global phenomena of this kind are at least partly understood and one of these has led to the first successful global environmental protection policy. Both phenomena are part of the atmospheric budget of greenhouse gas No. 3, namely ozone. The first phenomenon is depletion of stratospheric ozone by chlorine and bromine containing compounds derived from halogenated hydrocarbons, the second is ozone formation in the troposphere driven by air polluting precursor gases in the sun-lit atmosphere.
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