# The Air Quality Standards (Wales) Regulations 2007, Paragraph 10: Benzene and carbon monoxide


The National Assembly may allow for random measurements to be made instead of continuous measurements for benzene if the uncertainty, including the uncertainty due to random sampling, meets the quality objective of 25%. Random sampling must be spread evenly over the year.

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Source: https://www.legislation.gov.uk/wsi/2007/717/schedule/8/paragraph/10 (the official version)
Page: https://openlegislation.uk/air-quality-standards-wales-regulations-2007/schedule-8/paragraph-10
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.