# 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, Division 4

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

Member States should ensure that whenever appropriate, the correction is also applied retroactively to past measurement data in order to achieve better data comparability.

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Source: https://www.legislation.gov.uk/eudr/2008/50/annex/VI/division/B/division/4 (the official version)
Page: https://openlegislation.uk/eu-directive-2008-50/annex-VI/division-B/division-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.