Stratospheric ozone refers to the layer of the atmosphere between 20 and 50 km altitude. By filtering out a large part of the solar ultraviolet (UV) radiation, mainly UVC and UVB rays, this layer protects living beings, overexposure to UV rays that can have harmful effects on human health (cataracts, skin cancer, weakening of the immune system) and on plants (inhibition of the photosynthetic activity of plants). Guaranteeing the integrity of the ozone layer is therefore a major issue, its excessive thinning, or even its disappearance in certain areas, which can have serious consequences for humans and ecosystems.

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