(b)
Directive (EU) 2024/2881 of the European Parliament and of the Council of 23 October 2024 on ambient air quality and cleaner air for Europe (recast) · European Union
when 10 years before the AEI was < 12,0 μg/m3 and ≥ 10,0 μg/m3: 15 % lower than the AEI was 10 years before or 9,0 μg/m3, whichever is the lower;
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Source: EUR-Lex (Cellar) · retrieved 2026-10-16 · Text as adopted (Official Journal); later amendments are not incorporated in this text.