Case C-375/21, Sdruzhenie ‘Za Zemyata — dostap do pravosadie’ and Others: Judgment of the Court (Second Chamber) of 9 March 2023 (request for a preliminary ruling from the Varhoven administrativen sad — Bulgaria) — Sdruzhenie ‘Za Zemyata — dostap do pravosadie’, ‘Тhe Green Тank — grazhdansko sdruzhenie s nestopanska tsel’ — Hellenic Republic, NS v Izpalnitelen director na Izpalnitelna agentsia po okolna sreda, ‘TETS Maritsa iztok 2’ EAD (Reference for a preliminary ruling — Environment — Ambient air quality — Directive 2008/50/EC — Articles 13 and 23 — Limit values for the protection of human health — Exceedance — Air quality plan — Directive 2010/75/EU — Integrated pollution prevention and control — Update of a permit to operate a power plant — Emission limit values — Article 15(4) — Application for a derogation setting less strict emission limit values — Significant pollution — Article 18 — Compliance with environmental quality standards — Obligations of the competent authority)