Article 27 1

1.   Member States shall ensure that, in accordance with their national legal system, members of the public concerned have access to a review procedure before a court of law, or another independent and impartial body established by law, to challenge the substantive or procedural legality of all decisions, acts or omissions by Member States concerning the location and number of sampling points under Article 9 in accordance with the relevant criteria laid down in Annexes III and IV, air quality plans and air quality roadmaps referred to in Article 19, and short-term action plans referred to in Article 20, of the Member State, provided that any of the following conditions is met:

Member States shall determine what constitutes a sufficient interest and impairment of a right consistently with the objective of giving the public concerned wide access to justice.

To that end, the interest of any non-governmental organisation that promotes the protection of human health or the environment and meeting any requirements under national law shall be deemed sufficient for the purposes of the first subparagraph, point (a). Such organisations shall also be deemed to have rights capable of being impaired for the purposes of the first subparagraph, point (b).