Case C-730/19: Judgment of the Court (Seventh Chamber) of 12 May 2022 — European Commission v Republic of Bulgaria (Failure of a Member State to fulfil obligations — Environment — Directive 2008/50/EC — Ambient air quality — Article 13(1) and Annex XI — Systematically and persistently exceeding limit values for sulphur dioxide (SO2) in zone BG0006 (South-East), Bulgaria — Article 23(1) and Annex XV — Exceedance period to be ‘as short as possible’ — Appropriate measures)