# The Air Quality (Ozone) (Wales) Regulations 2003, 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)
Other zones (suburban and rural)
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
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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Source: https://www.legislation.gov.uk/wsi/2003/1848/schedule/3/part/I (the official version)
Page: https://openlegislation.uk/air-quality-ozone-wales-regulations-2003/schedule-3/part-I
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.