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ETC HE Report 2022/23: Evaluation of European-wide map creation of flux-based ozone indicator POD for selected tree species.

O3 is considered to be the most damaging common air pollutant for vegetation. The current indicator used to protect vegetation against negative impacts of O3 is the AOT40. Nevertheless, it is widely acknowledged that the impacts of O3 are more closely related to the instantaneous O3 flux or O3 dose absorbed through the stomata than to O3 exposure in the ambient air. For this reason, maps of POD1 (i.e. Phytotoxic Ozone Dose) for tree species of beech and spruce have been prepared using the methodology described in the Manual for modelling and mapping critical loads and levels of the Air Convention (CLRTAP). Subsequently, it can be concluded that the inclusion of POD for selected trees in routine mapping along with the other maps already produced is feasible.

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