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The Air Quality Limit Values (Wales) Regulations 2002
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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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