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The Air Quality Limit Values (Scotland) Regulations 2001

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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 agglomeration or zone (thousands)If concentrations exceed the upper assessment thresholdIf maximum concentrations are between the upper and lower assessment thresholdsFor SO2 and NO2 in agglomerations where maximum concentrations are below the lower assessment threshold
0–24911not applicable
250–499211
500–749211
750–999311
1 000–1 499421
1 500–1 999521
2 000–2 749632
2 750–3 749732
3 750–4 749842
4 750– 5 999942
> 6 0001053
For NO2 and particulate matter: to include at least one urban-background station and one traffic-orientated station

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.

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