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Air pollution

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4.4. AOT40<br />

Accumulated<br />

dose Over<br />

a Threshold<br />

of 40 ppb<br />

Parameter used to represent the accumulated dose :<br />

AOT40 is the sum of the differences between the hourly mean<br />

ozone concentration (in ppb) and 40 ppb for each hour when the<br />

concentration exceeds 40 ppb, accumulated during daylight hours.<br />

40 ppb Ozone as background<br />

Herschbach 2007

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