Court of Justice (Sixth Chamber) 13 March 2019, C-128/17 (Republic of Poland v European Parliament and Council of the European Union.)

JUDGMENT OF THE COURT (Sixth Chamber) 13 March 2019 ( *1 ) (Action for annulment — Directive (EU) 2016/2284 — Reduction of national emissions of certain atmospheric pollutants — Adoption of EU legal acts — Course of the legislative procedure — Article 4(3) TEU — Principle of sincere cooperation — Actual exercise of the EU legislature’s discretion — Impact assessment — Sufficient assessment of the