# The Air Quality Standards (Wales) Regulations 2007, Paragraph 11


The data quality objectives set out in the table and paragraphs below are provided to guide quality assurance programmes—
Benzo(a) pyrene
Arsenic, cadmium and nickel
Polycyclic aromatic hydrocarbons and total gaseous mercury
Total deposition
(1) Indicative measurement being measurements which are performed at reduced regularity but fulfil the other data quality objectives.
Uncertainty
Fixed and indicative measurements
50%
40%
50%
70%
Modelling
60%
60%
60%
60%
Minimum data capture
90%
90%
90%
90%
Minimum time coverage
Fixed measurements
33%
50%
Indicative measurements
14%
14%
14%
33%

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Source: https://www.legislation.gov.uk/wsi/2007/717/schedule/8/paragraph/11 (the official version)
Page: https://openlegislation.uk/air-quality-standards-wales-regulations-2007/schedule-8/paragraph-11
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.