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Records of effects of ambient ozone pollution on vegetation have been compiled for Europe for the years 1990–2006. Sources include scientific papers, conference proceedings, reports to research funders, records of confirmed ozone injury symptoms and an international biomonitoring experiment coordinated by the ICP Vegetation. The latter involved ozone‐sensitive (NC‐S) and ozone‐resistant (NC‐R) biotypes...
In Europe the risk of ozone damage to vegetation is assessed using two different metrics, the concentration-based AOT40 index and the flux-based AF st Y index. An important part of the definition of both these indices is that ozone concentrations must be known at the top of the vegetation canopy. An estimate of canopy-top concentrations entails an estimate of the above-canopy concentration...
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