# The Air Quality Standards Regulations 2010, Paragraph 5


Where contributions from industrial sources are to be assessed, at least one sampling point must be installed downwind of the source in the nearest residential area. Where the background concentration is not known, an additional sampling point must be situated within the main wind direction.

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Source: https://www.legislation.gov.uk/uksi/2010/1001/schedule/1/paragraph/5 (the official version)
Page: https://openlegislation.uk/air-quality-standards-regulations-2010/schedule-1/paragraph-5
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.