11. The data quality objectives set out in the following table are provided to guide quality assurance—
| 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(1) | 14% | 14% | 14% | 33% |