Judgment of the Court (Second Chamber) of 9 March 2023.#Sdruzhenie 'Za Zemyata – dostap do pravosadie' and Others v Izpalnitelen director na Izpalnitelna agentsia po okolna sreda and '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.#Case C-375/21.