Pollution Level, Sources, and Lung Cancer Risk of PM₁₀-Bound Polycyclic Aromatic Hydrocarbons (PAHs) in Summer in Nanjing, China

Table 1

Typical diagnostic ratios and corresponding judge criteria.

Ratio	Specific value	Source identification	References
ANT/(ANT + PHE)	<0.1	Petroleum	[5]
	>0.1	Combustion
BaA/(BaA + CHR)	<0.2	Petroleum
	0.2–0.35	Mixed sources	[5]
	>0.35	Combustion
FLA/(FLA + PYR)	<0.4	Petroleum
	0.4–0.5	Petroleum combustion	[5]
	>0.5	Grass, wood, & coal combustion
IcdP/(IcdP + BghiP)	<0.2	Petroleum
	0.2–0.5	Petroleum combustion	[5]
	>0.5	Grass, wood, & coal combustion
BaP/BghiP	<0.6	Nontraffic exhaust	[6]
	>0.6	Traffic exhaust	[7]
FLO/(FLO + PYR)	<0.5	Gasoline vehicle emissions	[8]
	>0.5	Diesel vehicle emissions