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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.

0–249111 station/50,000 km² as an average density over all zones in England(2)
250–49912
500–99922
1,000–1,49933
1,500–1,99934
2,000–2,74945
2,750–3,74956
3,750 or more1 additional station per 2 million inhabitants1 additional station per 2 million inhabitants

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