# The Air Quality Standards (Wales) Regulations 2007, Paragraph 9


Where the objective is to assess background levels the sampling site should not be influenced by agglomerations or industrial sites in its vicinity, i.e. sites closer than a few kilometres.

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Source: https://www.legislation.gov.uk/wsi/2007/717/schedule/5/paragraph/9 (the official version)
Page: https://openlegislation.uk/air-quality-standards-wales-regulations-2007/schedule-5/paragraph-9
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.