) is an air pollutant known to negatively affect vegetation. Typically, high O3
concentrations reduce growth. This study investigated the effect of O3
uptake on the total amount of carbon assimilated by vegetation for a Scots pine stand in Flanders over the period 1998–2013. Although the critical levels for AOT40 and POD1
, two indices currently used to estimate O3
damage, were exceeded every year, no O3
effects on daily and growing season GPP were found.