The survey of crown condition pursuant to Article 2 and Article 6(a) is mandatory and shall be carried out on all Level I points and Level II plots and shall be repeated annually. The following provisions are based on technical recommendations of Expert Panel on Crown Condition of the UNECE International Cooperative Programme on Assessment and Monitoring of Air Pollution Effects on Forests (ICP Forests).
Les dispositions ci-dessous reposent sur les recommandations techniques formulées par le groupe d’experts sur l’état des couronnes du Programme international concerté sur l’évaluation et la surveillance des effets de la pollution atmosphérique sur les forêts (PIC-Forêts) de la CEE-ONU.