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The Air Quality Standards Regulations 2007
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7. The minimum number of sampling points for fixed measurement of ozone to assess compliance with the target values, long-term objectives and information and alert thresholds where continuous measurement is the sole source of information is set out in the following table—
| Population of zone (thousands) | Agglomerations (urban and suburban)(1) | Other zones (suburban and rural)(1) | Rural background |
|---|---|---|---|
(1) At least 1 station in suburban areas, where the highest exposure of the population is likely to occur. In agglomerations at least 50% of the stations shall be located in suburban areas. | |||
(2) 1 station per 25,000 km² for complex terrain is recommended by Directive 2002/3/EC. | |||
| 0–249 | 1 | 1 | 1 station/50,000 km² as an average density over all zones in England(2) |
| 250–499 | 1 | 2 | |
| 500–999 | 2 | 2 | |
| 1,000–1,499 | 3 | 3 | |
| 1,500–1,999 | 3 | 4 | |
| 2,000–2,749 | 4 | 5 | |
| 2,750–3,749 | 5 | 6 | |
| 3,750 or more | 1 additional station per 2 million inhabitants | 1 additional station per 2 million inhabitants | |
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