Most ozone (about 90%) is found in the stratosphere, which begins at about 10–16 kilometres above Earth`s surface and extends to an altitude of about 50 kilometres. Ozone in the stratosphere protects life on Earth from harmful ultraviolet (UV) radiation and is therefore often called good ozone.

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The Dobson Unit is the most common unit for measuring ozone concentration.

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Ozone in the stratosphere protects life on Earth from harmful ultraviolet (UV) radiation and is therefore often called good ozone. This is in contrast to ozone in the troposphere, the lowest layer of the atmosphere, where it is an air pollutant and can be harmful to humans, animals and vegetation.

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Ozone depleting substances include:

1. chlorofluorocarbons (CFCs)
2. hydrochlorofluorocarbons (HCFCs)
3. hydrobromoflurocarbons (HBFCs)
4. halons
5. methyl bromide
6. carbon tetrachloride
7. methyl chloroform.

They have been used as:

1. refrigerants in commercial, home and vehicle air conditioners and refrigerators
2. foam blowing agents
3. components in electrical equipment
4. industrial solvents
5. solvents for cleaning (including dry cleaning)
6. aerosol spray propellants
7. fumigants.

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Ground-level ozone (O₃), also known as surface-level ozone and tropospheric ozone, is a trace gas in the troposphere (the lowest level of the Earth`s atmosphere), with an average concentration of 20–30 parts per billion by volume (ppbv), with close to 100 ppbv in polluted areas.

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