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SCHEDULE 5 continued PART 2
3. The following table sets out the minimum number of sampling points for fixed measurements to assess compliance with limit values for the protection of ecosystems or vegetation in zones other than agglomerations.
| Where maximum concentrations exceed the upper assessment threshold | Where maximum concentrations are between the upper and lower assessment thresholds |
|---|---|
| 1 station every 20,000 km2 | 1 station every 40,000 km2 |
4. In island zones the number of sampling points for fixed measurement shall be calculated taking into account the likely distribution patterns of ambient-air pollution and the potential exposure of ecosystems or vegetation.
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.
(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. |
||||
| 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 | |
| 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 |
6. For the assessment of pollution in the vicinity of point sources, the number of sampling points for fixed measurement shall be determined taking into account emission densities, the likely distribution patterns of ambient air pollution and potential exposure of the population. The sampling points shall be sited such that the application of the measures referred to in regulation 7(2)(b) can be monitored.
The Air Quality Standards Regulations 2007