Ozone is a molecule formed of three oxygen atoms. It’s found in small quantities near the ground, in the air we breathe, and in greater densities up in the sky, above all at heights of 9 to 22 miles. Hence why the part of the stratosphere nearest to us is known as the ozonosphere, or more commonly the ozone layer.
This bit of sky plays a crucial part in protecting life on earth, because it filters out the most dangerous ultraviolet rays from the sun. We’ve known for years that the depletion of this corner of space –especially where it hangs over the earth’s two poles– has had global repercussions on the climate. The effect is often and inappropriately called the “hole” in the ozone layer. The ozone layer is at the centre of a debate full of clashing opinions and theories.