# The Air Quality Limit Values (Wales) Regulations 2002, Paragraph 4: Nature and assessment of pollution

Extent: E+W

—0 concentrations observed over previous years (before the implementation of the improvement measures)
—0 concentrations measured since the beginning of the project
—0 techniques used for the assessment.

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Source: https://www.legislation.gov.uk/wsi/2002/3183/schedule/7/paragraph/4 (the official version)
Page: https://openlegislation.uk/air-quality-limit-values-wales-regulations-2002/schedule-7/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.