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The Air Quality Standards Regulations 2007
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1. This Part sets out the minimum number of sampling points for fixed measurement of Group A pollutants to assess compliance with limit values for the protection of human health and alert thresholds in zones where fixed measurement is the sole source of information.
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| Population of zone (thousands) | Where concentrations exceed the upper assessment threshold(1) | Where maximum concentrations are between the upper and lower assessment thresholds | For nitrogen dioxide and sulphur dioxide in agglomerations where maximum concentrations are below the lower assessment thresholds |
|---|---|---|---|
(1) For NO2 and PM10 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. | |||
| 0–249 | 1 | 1 | 1 |
| 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 or more | 10 | 5 | 3 |
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