(c)
for terrestrial ecosystems: assessing ozone damage to vegetation growth and biodiversity: the key indicator vegetation growth and foliar damage and the supporting indicator carbon flux (C_(flux)): frequency of sampling: every year; the key indicator exceedance of flux-based critical levels: frequency of sampling: every year during the growing season.
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Source: EUR-Lex (Cellar) · retrieved 2026-10-29 · Text as adopted (Official Journal); later amendments are not incorporated in this text.