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The Air Quality Standards (Wales) Regulations 2007

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11.  The data quality objectives set out in the table and paragraphs below are provided to guide quality assurance programmes—

Benzo(a) pyreneArsenic, cadmium and nickelPolycyclic aromatic hydrocarbons and total gaseous mercuryTotal deposition
(1)

Indicative measurement being measurements which are performed at reduced regularity but fulfil the other data quality objectives.

Uncertainty
Fixed and indicative measurements50%40%50%70%
Modelling60%60%60%60%
Minimum data capture90%90%90%90%
Minimum time coverage
Fixed measurements33%50%
Indicative measurements(1)14%14%14%33%

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