# 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: Nature and assessment of pollution

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

(a) concentrations observed over previous years (before the implementation of the improvement measures);
(b) concentrations measured since the beginning of the project;
(c) techniques used for the assessment.

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