Case C-220/22: Judgment of the Court (Sixth Chamber) of 29 June 2023 — European Commission v Portuguese Republic (Failure of a Member State to fulfil obligations — Environment — Directive 2008/50/EC — Ambient air quality — Systematic and persistent exceedance of the annual limit value for nitrogen dioxide (ΝΟ2) — Appropriate measures — As short an exceedance period as possible)