Table 3.

Exposure and dose of experimental animal groups (N = 10/group).

Group	Exposure	Dose (mg/kg of body weight)
1	Saline	-
2	RTD	0.3
3	RTD	1
4	RTD	3
5	RTD	10
6	EHC -93	10

Biological responses were examined 4, 24 and 48 hours after exposure. Abbreviations: RTD – particulate matter collected at the motorway tunnel in Hendrik-Ido-Ambacht, the Netherlands; EHC-93 – Ottawa dust [22].