5. This Part sets out the minimum number of sampling points for fixed measurement of Group B pollutants to assess compliance with target values in zones where fixed measurement is the sole source of information.
Diffuse sources
| Population of zone (thousands) | Where maximum concentrations exceed the upper assessment threshold(1) | Where maximum concentrations are between the upper and lower assessment thresholds | ||
|---|---|---|---|---|
| Arsenic, Cadmium, Nickel | Benzo(a)pyrene | Arsenic, Cadmium, Nickel | Benzo(a)pyrene | |
(1) To include at least one urban-background station and for benzo(a)pyrene also one traffic-oriented station provided this does not increase the number of sampling points. | ||||
| 0–749 | 1 | 1 | 1 | 1 |
| 750–1999 | 2 | 2 | 1 | 1 |
| 2000–3749 | 2 | 3 | 1 | 1 |
| 3750–4749 | 3 | 4 | 2 | 2 |
| 4750–5999 | 4 | 5 | 2 | 2 |
| 6000 or more | 5 | 5 | 2 | 2 |