# The Air Quality (Wales) Regulations 2000, Paragraph 7

Extent: E+W

The reference to a number of micrograms or milligrams per cubic metre of a substance is a reference to the number of micrograms or milligrams per cubic metre of that substance when measured with the volume standardised at a temperature of 293 K and at a pressure of 101.3 kPa.

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Source: https://www.legislation.gov.uk/wsi/2000/1940/schedule/paragraph/7 (the official version)
Page: https://openlegislation.uk/air-quality-wales-regulations-2000/schedule/paragraph-7
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.