The EQS suggested by WHO to protect human health (WHO, 2006),
that the [O3]8h,max should not exceed 50 ppb, is projected to be exceeded
at all eight sites also in the future (Fig. 8). The stabilization of the future
[O3]8h,max fromca. 2030 is caused by more modest changes in the European
ozone precursor emission in CLEO Eurobase (Fig. 2) combined
with assumed constant hemispheric background concentrations in
this simulation.