2.

In accordance with the criteria referred to in Article 4 (3), and in respect of the relevant pollutants under Article 4 (3), measurement is mandatory in the following zones: agglomerations as defined in Article 2 (10), zones in which levels are between the limit values and the levels provided for in paragraph 3, and other zones where levels exceed the limit values. The measures provided for may be supplemented by modelling techniques to provide an adequate level of information on ambient air quality.

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Source: EUR-Lex (Cellar) · retrieved 2026-10-12 · Text as adopted (Official Journal); later amendments are not incorporated in this text.