# The Air Quality Standards (Wales) Regulations 2007, Paragraph 5: Group A pollutants (other than benzene and carbon monoxide) and PM2·5


The National Assembly may allow for random measurements to be made instead of continuous measurements for lead, PM2·5 and PM10 by methods for which accuracy within the 95% confidence interval with respect to continuous monitoring has been demonstrated to be within 10%. 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/5 (the official version)
Page: https://openlegislation.uk/air-quality-standards-wales-regulations-2007/schedule-8/paragraph-5
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.