Table 5.

Inhalation toxicity factors for targeted VOCs and carbon range fractions.

Chemical	IUR 1 (µg/m3)−1	RfC 2 (µg/m3)
Benzene	7.8E−06	30
Ethylbenzene	2.5E−06	1,000
Toluene		5,000
Xylenes		100
Naphthalene	3.4E−05	3.0
C5-C8 aliphatics		600
C9-C18 aliphatics		100
C9+ aromatics		100

¹ Inhalation Unit Risk [22]; ² Reference Concentration; BTEXN RfCs from USEPA [22]; Carbon Range RfCs from USEPA [16].