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

Extent: E+W

The accuracy of the measurement is defined as laid down in the “Guide to the Expression of Uncertainty of Measurements" (ISO 1993) or in ISO 5725-1 “Accuracy (trueness and precision) of measurement methods and results" (ISO 1994) . The percentages in the table are given for individual measurements averaged, over the period considered, by the limit value, for a 95% confidence interval (bias + two times the standard deviation). The accuracy for continuous measurements should be interpreted as being applicable in the region of the appropriate limit value.

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Source: https://www.legislation.gov.uk/wsi/2002/3183/schedule/5/part/I/paragraph/wrapper15n1 (the official version)
Page: https://openlegislation.uk/air-quality-limit-values-wales-regulations-2002/schedule-5/part-I/paragraph-wrapper15n1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.