Division (a) Diffuse sources
United Kingdom
| 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. | ||||
| Population of agglomeration or zone(thousands) | If maximum concentrations exceed the upper assessment thresholdf1 | If maximum concentrations are between the upper and lower assessment thresholds | ||
|---|---|---|---|---|
| As, Cd, Ni | B(a)P | As, Cd, Ni | B(a)P | |
| 0–749 | 1 | 1 | 1 | 1 |
| 750–1 999 | 2 | 2 | 1 | 1 |
| 2 000–3 749 | 2 | 3 | 1 | 1 |
| 3 750–4 749 | 3 | 4 | 2 | 2 |
| 4 750–5 999 | 4 | 5 | 2 | 2 |
| ≥ 6 000 | 5 | 5 | 2 | 2 |
Annotations
Footnotes
- f1
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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.