# The Air Quality Standards (Wales) Regulations 2007, Paragraph 16


The data quality objectives set out in the table and paragraphs below, for allowed uncertainty of assessment methods, and of minimum time coverage and of data capture of measurement, are provided to guide quality-assurance programmes—
For ozone, NO and NO2 assessed at ozone sampling points
Continuous fixed measurement
Uncertainty of individual measurements
15%
Minimum data capture
90% during summer; 75% during winter
Indicative measurement
Uncertainty of individual measurements
30%
Minimum data capture
90%
Minimum time coverage
>10% during summer
Modelling
Uncertainty
1 hour averages (daytime)
50%
8 hours daily maximum
50%
Objective estimation
Uncertainty
75%

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Source: https://www.legislation.gov.uk/wsi/2007/717/schedule/8/paragraph/16 (the official version)
Page: https://openlegislation.uk/air-quality-standards-wales-regulations-2007/schedule-8/paragraph-16
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.