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The Air Quality Standards Regulations (Northern Ireland) 2007

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5.  This Part sets out the minimum number of sampling points for fixed measurement of Group B pollutants to assess compliance with target values in zones where fixed measurement is the sole source of information.

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Population of zone (thousands)Where maximum concentrations exceed the upper assessment threshold(1)Where maximum concentrations are between the upper and lower assessment thresholds
Arsenic, Cadmium, NickelBenzo(a)pyreneArsenic, Cadmium, NickelBenzo(a)pyrene
(1)

To include at least one urban-background station and for benzo(a)pyrene also one traffic-oriented station provided this does not increase the number of sampling points.

0–7491111
750–19992211
2000–37492311
3750–47493422
4750–59994522
6000 or more5522

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