# The Air Quality Standards (Wales) Regulations 2007, Paragraph 14


The National Assembly may allow for use of wet only instead of bulk sampling if it can be demonstrated to its satisfaction that the difference between them is within 10 %. Deposition rates should generally be given as μg/m2 per day.

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Source: https://www.legislation.gov.uk/wsi/2007/717/schedule/8/paragraph/14 (the official version)
Page: https://openlegislation.uk/air-quality-standards-wales-regulations-2007/schedule-8/paragraph-14
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.