# Directive 2008/50/EC of the European Parliament and of the Council of 21 May 2008 on ambient air quality and cleaner air for Europe, Article 18: Requirements in zones and agglomerations where ozone concentrations meet the long-term objectives

Extent: E+W+S+N.I.

In zones and agglomerations in which ozone levels meet the long-term objectives, Member States shall, in so far as factors including the transboundary nature of ozone pollution and meteorological conditions permit, maintain those levels below the long-term objectives and shall preserve through proportionate measures the best ambient air quality compatible with sustainable development and a high level of environmental and human health protection.

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Source: https://www.legislation.gov.uk/eudr/2008/50/article/18 (the official version)
Page: https://openlegislation.uk/eu-directive-2008-50/article-18
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.