Terme de Glossaire

ozone

A molecule of trioxygen (O3) which is relatively unstable with a characteristic odor that can be detected where there is a large electrical field (an electric arc for example). This gas is naturally present in Earth’s atmosphere, forming in the stratosphere a layer of the atmosphere that intercepts a large amount of the UV radiation from the sun. If, on the other hand, it is present in too large a quantity in the air we breathe (frequently the case in towns during heat waves for example), it becomes an aggressive pollutant which attacks the bronchi. In this case, it is generally produced by the action of solar radiation on certain pollutants from cars and industrial activity.

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