# Directive 2004/107/EC of the European Parliament and of the Council of 15 December 2004 relating to arsenic, cadmium, mercury, nickel and polycyclic aromatic hydrocarbons in ambient air, Division (a): Diffuse sources

Extent: E+W+S+N.I.

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.
Population of agglomeration or zone(thousands)
If maximum concentrations exceed the upper assessment threshold
If maximum concentrations are between the upper and lower assessment thresholds
As, Cd, Ni
B(a)P
As, Cd, Ni
B(a)P
0–749
1
1
1
1
750–1 999
2
2
1
1
2 000–3 749
2
3
1
1
3 750–4 749
3
4
2
2
4 750–5 999
4
5
2
2
≥ 6 000
5
5
2
2

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Source: https://www.legislation.gov.uk/eudr/2004/107/annex/III/division/IV/division/1/division/a (the official version)
Page: https://openlegislation.uk/eu-directive-2004-107/annex-III/division-IV/division-1/division-a
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.