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Ozone is a pollutant found in our cities, but plays a more crucial role high up in the atmosphere in the so called ‘Ozone layer’. This diffuse layer of ozone from 20 to 30 km absorbs harmful UV radiation from the sun and protects life on Earth.

The section ‘What is the Ozone layer’ describes this protective layer and how it benefits us. It also covers the history of its discovery, and depletion of ozone leading to the ozone hole over Antarctica, which is now starting to recover due to the ban on ozone depleting chemicals, the Montreal Protocol in 1987.

The section on ‘Ozone Research’ gives an overview of the research into measurements of ozone since the Dobson ozone spectrophotometer was first used, through to the present day.

How to measure Ozone’ gives an overview of the characteristics of atmospheric ozone that are typically measured, and the types of instruments most commonly used to measure total ozone from the ground. It then covers how the Dobson and Brewer spectrophotometers make measurements in more detail.