Court of Justice 19 December 2019, Case C-752/18: Judgment of the Court (Grand Chamber) of 19 December 2019 (request for a preliminary ruling from the Bayerischer Verwaltungsgerichtshof — Germany) — Deutsche Umwelthilfe eV v Freistaat Bayern (Reference for a preliminary ruling — Environment — Article 6, the first paragraph of Article 47 and Article 52(1) of the Charter of Fundamental Rights of the European Union — Directive 2008/50/EC — Atmospheric pollution — Ambient air quality — Air quality plan — Limit values for nitrogen dioxide — Obligation to adopt appropriate measures to ensure that any exceedance period is very short — Obligation on the national courts to take any necessary measure — Refusal of a regional government to comply with an injunction — Coercive detention contemplated in respect of senior political representatives or senior officials of the region concerned — Effective judicial protection — Right to liberty of the person — Legal basis — Proportionality)

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