Case C-125/20: Judgment of the Court (Sixth Chamber) of 22 December 2022 — European Commission v Kingdom of Spain (Failure of a Member State to fulfil obligations — Environment — Directive 2008/50/EC — Ambiant air quality — Article 13(1) — Annex XI — Systematic and persistent exceedance of the limit values for nitrogen dioxide (NO2) in certain Spanish zones and agglomerations — Article 23(1) — Annex XV — Exceedance period to be ‘as short as possible’ — Appropriate measures)