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The Air Quality (Ozone) (Wales) Regulations 2003
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PART I
Minimum number of sampling points for fixed continuous measurement to assess air quality in view of compliance with the target values, long-term objectives and information and alert thresholds where continuous measurement is the sole source of information
| Population (x 1,000) | Agglomerations (urban and suburban) (a) | Other zones (suburban and rural) (a) | Rural background |
|---|---|---|---|
(a) 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 should be located in suburban areas. | |||
(b) 1 station per 25,000 km2 for complex terrain is recommended. | |||
| 0 — 250 | 1 | 1 station/50,000 km2 as an average density over all zones per country (b) | |
| 251 — 500 | 1 | 2 | |
| 501 — 1,000 | 2 | 2 | |
| 1,001 — 1,500 | 3 | 3 | |
| 1,501 — 2,000 | 3 | 4 | |
| 2,001 — 2,750 | 4 | 5 | |
| 2,751 — 3,750 | 5 | 6 | |
| > 3,750 | 1 additional station per 2 million inhabitants | 1 additional station per 2 million inhabitants | |
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