Thickness of the ozone layer in Uccle
The greatest part of the ozone occurs in the stratosphere between about 10 and 30 km height. Ozone is nevertheless in every layer of the atmosphere. When we can bring the ozone in all those layers together in only one fictif layer under standard conditions of pressure and temperature (at 1013,25 hPa and 0°C), we would obtain a small layer with a determined thickness. This thickness of the ozone layer is expressed in Dobson units, that defines the thickness in hundredths of a millimetre.
The blue and black line show the day averages of the thickness of the ozone layer respectively during the running year and the preceding year. The orange line shows the average values observed between 1971 and now. The orange band indicates the limits within 95% of all day averages.
You can find more information on the web pages of the ozone research group of the RMI.