Table 3
Mean concentration of PM
2.5
and PNC in drivers’ cabs
Location
PM
2.5
(μg/m
3
) Mean (SD)
PNC (particles/cm
3
) Mean (SD)
Central Line
130 (12)
23000 (3500)
Northern Line
200 (1)
17000 (1700)
Victoria Line
180 (13)
22000 (5000)