The Air Quality Standards Regulations (Northern Ireland) 2010 No. 188

SCHEDULE 1 Sampling points for measurement of sulphur dioxide, nitrogen dioxide and oxides of nitrogen, particulate matter, lead, benzene and carbon monoxide in ambient air

PART 2 Macroscale siting of sampling points

Sampling points for the protection of human health

6.  Sampling points shall also, where possible, be representative of similar locations not in their immediate vicinity.