Table 2

United Kingdom concentrations of benzene in outdoor air (μg/m³) for 1995 from the automatic hydrocarbon monitoring network^2-150

Location	Site	Start date	1995 Mean concentration	Maximum hourly concentration	Data capture (%)
Middlesborough	Urban industrial	Jan 1993	3.5	139	95
London	Roadside	Feb 1993	5.4	60	91
London	Suburban	Mar 1993	3.2	49	91
Belfast	Urban background	Aug 1993	2.9	109	95
Birmingham	Urban background	Aug 1993	3.2	108	95
Edinburgh	Urban background	Aug 1993	2.2	36	90
Cardiff	Urban background	Nov 1993	3.8	78	86
Bristol	Urban background	May 1994	3.8	100	93
Harwell	Rural	Jan 1995	1.3	15.4	74
Leeds	Urban background	Jan 1995	3.2	76	94
Southampton	Urban centre	Sep 1995	8.0^2-151	89	28
Liverpool	Urban background	Nov 1995	5.1^2-152	34	10

Values reported as ppb by the AEA.6
↵2-150 Each monitoring station uses instruments which sample and analyse the ambient air continuously to provide levels of resolution.
↵2-151 Mean concentration is a 4 monthly average as sampling was only conducted from September to December 1995.
↵2-152 Mean concentration is a 1 monthly average as sampling was only conducted during December 1995.
Concentrations for ^2-151 and ^2-152 sites were not representative of the year as a whole as monitoring was not conducted for a whole year.