Table 1.

Permissible exposure limit of hazardous components in petrol.

Chemical Name	Chemical Formula	Permissible Exposure Limit		Conversion of 1 ppm
		OSHA	NIOSH
Benzene	C6H6	TWA 1.0 ppm STEL 5.0 ppm	TWA 0.1 ppm STEL 1.0 ppm	3.19 mg/m3
Toluene	C6H5CH3	STEL 150 pm at 10 min maximum peak	TWA 100 ppm STEL 150 ppm	3.77 mg/m3
m-xylene	C6H4(CH3)2	TWA 150 ppm	TWA 100 ppm STEL 150 ppm	4.34 mg/m3
o-xylene	C6H4(CH3)2	TWA 150 ppm	TWA 100 ppm STEL 150 ppm	4.34 mg/m3
p-xylene	C6H4(CH3)2	TWA 150 ppm	TWA 100 ppm STEL 150 ppm	4.41 mg/m3

TWA-daily exposure on averaged to an 8-hour work/day.

STEL (short-term exposure limit of 15 min).

Sources* NIOSH (NIOSH, 2015)