Judgment of the Court (Sixth Chamber) of 23 March 2023.#European Commission v Hellenic Republic.#Failure of a Member State to fulfil obligations – Environment – Directive 2008/50/EC – Ambient air quality – Article 13(1) – Annex XI – Systematic and persistent exceedance of the daily limit value for microparticles (PM10) in the conurbation of Thessaloniki (EL0004) – Article 23(1) – Annex XV – Exceedance period to be ‘as short as possible’ – Appropriate measures.#Case C-70/21.