Table 1.

Exposure characteristics from the chamber compared with earlier performed study by Muala et al. [27]

		Present study	Muala et al. [27]
Exposure time		2 h	3 h
	Unit	Mean ± SD	Mean ± SD
PM1 mass concentration (TEOM)	μg/m3	453 ± 13	314 ± 38
PM1 mass concentration (filter)	μg/m3	409 ± 43	294 ± 36
CO	ppm	11 ± 2	25 ± 6
NO	ppm	0.21 ± 0.09	Not measured
NO2	ppm	0.02 ± 0.01	Not measured
NOx	ppm	0.23 ± 0.10	0.41 ± 0.12
EC/TC (elemental/total carbon)	ratio	0.78 ± 0.07	0.72 ± 0.08
Organic fraction of total PM1	%	27 ± 8	24 ± 8
Soot fraction of total PM1	%	62 ± 8	38 ± 9.9
Inorganic fraction of total PM1	%	10 ± 3	Not measured

Presented as mean values ± standard deviation (SD)