The Air Quality Standards (Wales) Regulations 2007 No. 717 (W. 63)

PART 2 Group A and Group B pollutants and ozone

CHAPTER 1 Air quality standards

Zones and agglomerations

5.—(1) The National Assembly must, for the purposes of this Part, divide the territory of Wales into zones.

(2) A zone is to be classified as an agglomeration for the purposes of this Part where—

(a) it comprises a population in excess of 250,000 inhabitants; or

(b) in any other case, it has a population density per km² for which the National Assembly considers that such a classification is justified.

(3) The National Assembly may establish different zones for different pollutants where it considers it appropriate.