5.
DIRECTIVE 2008/50/EC OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 21 May 2008 on ambient air quality and cleaner air for Europe · European Union
In zones and agglomerations where, during each of the previous five years of measurement, concentrations are below the long-term objectives, the number of sampling points for fixed measurements shall be determined in accordance with Section B of Annex IX.
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Source: EUR-Lex CELLAR · retrieved 2026-08-09 · Text as consolidated on 2015-09-18; changes after this date are not shown.