Article 18 4

4.   Member States shall notify the Commission no later than 31 January 2029 where, in their view, paragraph 1, first subparagraph, point (a) or (b), is applicable, and shall communicate the air quality roadmap referred to in paragraph 1 and all relevant information necessary for the Commission to assess whether the invoked reason for postponement and the conditions set out in that paragraph are satisfied.

Member States shall notify the Commission no later than 31 January 2034 where, in their view, attainment cannot be achieved by an attainment deadline postponed in accordance with paragraph 1, second subparagraph, and shall communicate the updated air quality roadmap referred to in paragraph 1 and all relevant information necessary for the Commission to assess whether the invoked reason for a second and last postponement and the conditions set out in that paragraph are satisfied.

As regards the projections provided as a reason for postponement, Member States shall justify the methods as well as the data used to obtain those projections.

In its assessment, the Commission shall take into account air quality projections provided by the Member State concerned, the estimated effects on ambient air quality in that Member State of measures that have been taken by that Member State as well as estimated effects on ambient air quality of Union measures.

Where the Commission has raised no objections within 9 months of receipt of that notification, the relevant conditions for the application of paragraph 1 shall be deemed to be satisfied.

If objections are raised, the Commission may require the Member State concerned to adjust or provide a new air quality roadmap to meet the requirements set out in paragraph 1.