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The Air Quality Limit Values (Wales) Regulations 2002
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- 2002 No. 3183 (W. 299)
- SCHEDULE 4
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Regulation 8(4)
SCHEDULE 4CRITERIA FOR DETERMINING MINIMUM NUMBERS OF SAMPLING POINTS FOR FIXED MEASUREMENT OF CONCENTRATIONS OF RELEVANT POLLUTANTS IN AMBIENT AIR
PART IMinimum number of sampling points for fixed measurement to assess compliance with limit values for the protection of human health and alert thresholds in zones and agglomerations where fixed measurement is the sole source of information
Diffuse sources
| Population of zone (thousands) | If concentrations exceed the upper assessment thresholds | If maximum concentrations are between the upper and lower assessment thresholds | For SO2 and NO2 in agglomerations where maximum concentrations are below the lower assessment threshold |
|---|---|---|---|
| 0 —250 | 1 | 1 | not applicable |
| 250 —499 | 2 | 1 | 1 |
| 500 —749 | 2 | 1 | 1 |
| 750 —999 | 3 | 1 | 1 |
| 1,000 —1,499 | 4 | 2 | 1 |
| 1,500 —1,999 | 5 | 2 | 1 |
| 2,000 —2,749 | 6 | 3 | 2 |
| 2,750 —3,749 | 7 | 3 | 2 |
| 3,750 —4,749 | 8 | 4 | 2 |
| 4,750 —5,999 | 9 | 4 | 2 |
| >6,000 | 10 | 5 | 3 |
| For NO2 and particulate matter: to include at least one urban-background station and one traffic-orientated station — this requirement shall also apply to benzene and carbon monoxide provided that it does not increase the number of sampling points. |
Point sources
(b)For the assessment of pollution in the vicinity of point sources, the number of sampling points for fixed measurement should be calculated taking into account emission densities, the likely distribution patterns of ambient-air pollution and the potential exposure of the population.
PART IIMinimum 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
| If maximum concentrations exceed the assessment threshold | If maximum concentrations are between the upper and lower assessment thresholds |
|---|---|
| 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 ecosystems or vegetation. | |
| 1 station every 20,000 km2 | 1 station every 40,000 km2 |
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