Rural concentration of the ozone indicator AOT40 for forest

Figure Created 19 Aug 2016 Published 21 Oct 2016 Last modified 21 Oct 2016, 12:25 PM
The gradient of the accumulated ozone exposure values for forests, over a threshold of 40 parts per billion (AOT40f), is similar to that of the AOT40c (crops). AOT40f increases from northern Europe to reach the highest values in the countries around the Mediterranean.


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(Accumulated dose of ozone Over a Threshold of 40 ppb)
AOT40 means the sum of the differences between hourly concentrations greater than 80 µg/m3 (= 40 parts per billion) and 80 µg/m3

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