While stratospheric ozone lessens environmental stress by attenuating UVB, there is also an issue of ozone pollution in the troposphere. Photochemical reactions of oxygen with by-products from automobile exhaust and industrial emissions result in surface accumulations of ozone. Ozone is a very reactive compound and direct contact with cells and tissues causes oxidative damage which can lead to death in plants and animals. Tropospheric ozone pollution is a growing concern for potential impacts on human health and ecosystems, but it is not related to the stratospheric ozone layer.
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