# The Air Quality Standards Regulations 2010, Paragraph 4


Where the objective is to assess rural background levels, the sampling point must not be influenced by agglomerations or industrial sites in its vicinity, i.e. closer than five kilometres.

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Source: https://www.legislation.gov.uk/uksi/2010/1001/schedule/1/paragraph/4 (the official version)
Page: https://openlegislation.uk/air-quality-standards-regulations-2010/schedule-1/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.