Table 4

Monitored concentrations of benzene in Teesside (ppb)

Monitoring location (see table1)		Year Zone^4-150		Type of monitoring
				42 Site study^4-151		Study survey 1993–4	Continuous monitoring 1992–3 mean of 2 y
				1994 Range of means over study period	Mean of all sites	Study survey 1993–4	Continuous monitoring 1992–3 mean of 2 y
Residential	N/A	0.5–1.9	1.2
Roadside	N/A	1.6–2.2	2.0
Industrial	N/A	0.6–2.8	1.2
Rural	N/A	N/A	0.5
Dormanstown (1)	A			1.4
Grangetown (2)	A			2.4
South Bank (4)	A			2.4
East Middlesbrough (6,8,10)	B			1.3	1.3
Blue Hall (18)	C			1.6
Hardwick (19)	C			1.1

↵4-150 Zone: A=near; B=intermediate; C=far.
↵4-151 Survey conducted by AEA Technology during a 2 week periods²⁶; continuous monitoring was part of the national automated urban network, analysed by^{25 28}.