Court of Justice 4 March 2021, Case C-664/18: Judgment of the Court (Seventh Chamber) of 4 March 2021 — European Commission v United Kingdom of Great Britain and Northern Ireland (Failure of a Member State to fulfil obligations — Environment — Directive 2008/50/EC — Ambient air quality — Article 13(1) and Annex XI — Systematic and persistent exceedance of the limit values for nitrogen dioxide (NO2) in certain areas of the United Kingdom — Article 23(1) — Annex XV — Exceedance period to be ‘as short as possible’ — Appropriate measures)

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