# The Air Quality Standards (Wales) Regulations 2007, Paragraph 5: Protection of ecosystems and vegetation


Sampling points targeted at the protection of ecosystems or vegetation should be sited more than 20 km from agglomerations or more than 5 km from other built-up areas, industrial installations or motorways. As a guideline, a sampling point should be sited to be representative of air quality in a surrounding area of at least 1000 km2. A sampling point may be sited at a lesser distance or to be representative of air quality in a less extended area, taking account of geographical conditions.

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