# The Air Quality Limit Values (Wales) Regulations 2002, Paragraph

Extent: E+W

If maximum concentrations exceed the assessment threshold
If maximum concentrations are between the upper and lower assessment thresholds
1 station every 20,000 km2
1 station every 40,000 km2

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Source: https://www.legislation.gov.uk/wsi/2002/3183/schedule/4/part/II/paragraph/wrapper12n1 (the official version)
Page: https://openlegislation.uk/air-quality-limit-values-wales-regulations-2002/schedule-4/part-II/paragraph-wrapper12n1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.