Study commissioned by Federal Public Service for Health, Food Chain Safety and the Environment, Directorate‐General for the Environment, Service for multilateral and strategic matters (SPSCAE) Bruxelles Environnement/Leefmilieu Brussel (IBGE‐BIM) Vlaamse overheid, Departement Leefmilieu, Natuur en Energie (LNE) Service public de Wallonie, Direction générale opérationnelle Agriculture, Ressources naturelles et Environnement (DGARNE)