Air quality continuous monitoring and their site locations in the Royal Borough

Site name	North Kensington	Cromwell Rd/ Cromwell Rd 2	Cromwell Rd 2	West London	Harrods	Chelsea Old Town Hall
Site type*	AURN affiliate LAQN	AURN	LAQN	AURN	LAQN	LAQN
Pollutants measured	nitrogen oxides PM₁₀ carbon monoxide sulphur dioxide	nitrogen oxides carbon monoxide sulphur dioxide	PM₁₀	nitrogen oxides carbon monoxide	nitrogen oxides	nitrogen oxides
Grid reference	TQ401821	TQ264789 (since1998) TQ265790	TQ265790	TQ251788	TQ2779SE	TQ2778SW
Site location and description	Sited in the grounds of Sion Manning school in St Charles Square, North Kensington. Surrounded by a mainly residential area. Height inlet is approx. 3m.	Originally sited at the kerbside of the Cromwell Rd. Traffic density approx. 60,000 vehicles per day. Now located at the rear of the pavement at the Natural History Museum, Cromwell Road. The height of the inlet is approx. 2m.	Located within the DETR monitoring cabin in the grounds of the Natural History Museum. Approx. within 4m of the Cromwell Rd and 3m of Queens Gate. Height inlet is approx. 1.4m.	Located within the Council depot, Pembroke Road. The nearest road is Warwick Rd (50m). The surrounding area is built-up. Height inlet is approx. 30m.	Located in the basement of Harrods, Brompton Road. The inlet height is approx. 3m.	Located within the Chelsea Old Town Hall basement, King’s Road. The inlet height is approx. 3m.
Site definition	Urban background	Roadside	Roadside	Urban background	Roadside	Roadside
Start date	1/4/1995 Affiliated from 1/4/1996	22/2/1973	22/5/1998	1/1/1987	1/04/2000	27/9/2000

*LAQN- London Air Quality Network, AURN- Automatic Urban and Rural Network

Site definitions:

Roadside: Located between 1-5 metres from a busy main road

Urban background: Within an urban location, and at least 50 metres away from any pollutant sources. It therefore should represent a city-wide background condition.