Table 2.

Diagnostic ratios reported for PAHs in soils.

PAHs	Diagnostic Ratio	Sources	Reference
Ant/(Ant + Phe)	<0.1	Petroleum	[14]
	>0.1	Combustion
Fla/(Fla + Pyr)	<0.4	Petroleum	[34]
	0.4–0.5	Liquid fossil fuelcombustion
	>0.5	Coal, wood or grass combustion
Baa/(Baa + Chr)	<0.2	Petroleum	[37]
	0.2–0.35	Petroleum or combustion
	>0.35	Combustion
Phe/Ant	<10	Pyrogenic	[40]
	<15	Petrogenic
Ind/(Ind + Bghip)	<0.2	Petrogenic	[38]
	0.2–0.5	Fuel combustion(vehicle and crude oil)
	>0.5	Grass/coal/wood combustion
Bap/(Bap + Chr)	<0.2	Petroleum	[39,40]
	0.2–0.35	Coal, wood or grass combustion
	>0.35	Vehicular combustion
HMW/LMW PAHs	>1	Pyrogenic	[41]
	<1	Petrogenic	[42]
Fla/Pyr	<1	Petrogenic	[43]
	>1	Pyrogenic	[39]
Bap/Bghip	>0.6	Traffic	[40]