4.
Council Directive 96/62/EC of 27 September 1996 on ambient air quality assessment and management · European Union
Nature and assessment of pollution concentrations observed over previous years (before the implementation of the improvement measures) concentrations measured since the beginning of the project techniques used for the assessment.
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Source: EUR-Lex (Cellar) · retrieved 2026-10-12 · Text as adopted (Official Journal); later amendments are not incorporated in this text.