Division C
United Kingdom
Minimum number of sampling points for fixed measurements to assess compliance with critical levels for the protection of vegetation in zones other than agglomerations
| If maximum concentrations exceed the upper assessment threshold | If maximum concentrations are between upper and lower assessment threshold |
| 1 station every 20 000 km2 | 1 station every 40 000 km2 |
In island zones the number of sampling points for fixed measurement should be calculated taking into account the likely distribution patterns of ambient-air pollution and the potential exposure of vegetation.