![]() An upset in the ozone balance can have serious consequences for life on Earth, as scientists are finding evidence that changes are occurring in ozone levels - the "bad" tropospheric ozone is increasing in the air we breathe, and the "good" stratospheric ozone is decreasing in our protective ozone layer. ![]() The amounts of "good" stratospheric and "bad" tropospheric ozone in the atmosphere depend on a balance between processes that create ozone and those that destroy it. Closer to Earth in the troposphere (the atmospheric layer from the surface up to about 10 km), ozone is a harmful pollutant that causes damage to lung tissue and plants. With a weakening of this shield, we would be more susceptible to skin cancer, cataracts and impaired immune systems. Most ozone resides in the stratosphere (a layer of the atmosphere between 10 and 40 km above us), where it acts as a shield to protect Earth's surface from the sun's harmful ultraviolet radiation. Credit: NASAĭepending on where ozone resides, it can protect or harm life on Earth. Image to right: The low ozone levels in this image are transparent (blue) while high levels are opaque (white). Although it represents only a tiny fraction of the atmosphere, ozone is crucial for life on Earth. Ozone (O3) is a relatively unstable molecule made up of three atoms of oxygen (O). ![]()
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