Table 8.

Mean* vapour concentrations (µg m−3) within 2 m of house, August 2013 to March 2015

VapourVP1VP2VP3VP4VP5
Naphthalene1.7*1.7*2.8232.9
Benzene4.8*5.15.18.14.8*
Toluene2425334252
Ethylbenzene6.76.5*6.8116.5*
m&p-xylenes106.5*11526.5*
1,2,4-trimethylbenzene7.57.4*9.3277.4*
Trichloroethene8.1*9.0723211
Tetrachloroethene123314015028

*Mean calculation includes detection limit values; values with an asterisk indicate detection limit. Mean from four monitoring rounds used for illustrative purposes. Values to two significant figures.