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This depletion phenomenon was first noticed in the late nineteen-seventies. Following the signature of the Montreal Protocol, which called for the phasing out of CFC and halon emissions, the further breakdown of stratospheric ozone came to halt in the late nineties, although it will be several decades before the ozone layer is completely "repaired."The second atmospheric zone where ozone is more or less uniformly present is the troposphere, the layer between the Earth's surface and an altitude of 10 to 16 kilometers. The ozone concentration here is only one-tenth that of the stratosphere. Although it is indeed the same molecule, tropospheric ozone is a pollutant. Its powerful oxidative action makes it a toxic gas when it reaches excessive levels. Vehicle exhaust fumes, which contain pollutants that undergo chemical reactions resulting in the production of ozone, are partly responsible for the increased ozone levels in the troposphere. When a certain "ozone peak" threshold is reached, public health warnings are issued and vehicle speed limits are reduced in densely populated areas.
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