# The Air Quality Standards (Wales) Regulations 2007, Paragraph 7


The sites of sampling points should be selected in such a way as to provide data on—
(a) the areas within zones where the population is likely to be directly or indirectly exposed to the highest concentrations averaged over a calendar year;
(b) concentrations in other areas within zones which are representative of the exposure of the general population;
(c) deposition rates representing the indirect exposure of the population through the food chain.

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Source: https://www.legislation.gov.uk/wsi/2007/717/schedule/5/paragraph/7 (the official version)
Page: https://openlegislation.uk/air-quality-standards-wales-regulations-2007/schedule-5/paragraph-7
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.