# The Air Quality Standards (Wales) Regulations 2007, Paragraph 8


In cases where zones attain the long-term objectives, the number of sampling points for ozone must, in combination with other means of supplementary assessment such as air quality modelling and co-located nitrogen dioxide measurements, be sufficient to examine the trend of ozone pollution and check compliance with the long-term objectives.

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Source: https://www.legislation.gov.uk/wsi/2007/717/schedule/6/paragraph/8 (the official version)
Page: https://openlegislation.uk/air-quality-standards-wales-regulations-2007/schedule-6/paragraph-8
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.