# The Air Quality Standards (Wales) Regulations 2007, Paragraph 4: Group A pollutants (other than benzene and carbon monoxide) and PM2·5


The requirements for minimum data capture and time coverage do not include losses of data due to the regular calibration or the normal maintenance of the instrumentation.

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Source: https://www.legislation.gov.uk/wsi/2007/717/schedule/8/paragraph/4 (the official version)
Page: https://openlegislation.uk/air-quality-standards-wales-regulations-2007/schedule-8/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.