Table 2.

Spatial and temporal variation of annual mean diagnostic ratio of PAHs

Site name	Season	Ant/(Ant + Phe)	Flua/(Flua + Pyr)	BaA/(BaA + Chr)	IcP/(IcP + B(ghi)P)	BaP/B(ghi)P
BKR	Winter	0.4–0.5	0.4–0.6	0.4–0.5	0.4–0.6	0.6–1.8
	Summer	0.3–0.6	0.4–0.6	0.4–0.6	0.5–0.8	0.6–2.4
	Monsoon	0.1–0.5	0.4–0.6	0.3–0.5	0.1–0.3	0.0–1.8
	Post-monsoon	0.2–0.4	0.4–0.6	0.4–0.6	0.1–0.4	0.0–0.8
GHY	Winter	0.4–0.5	0.4–0.6	0.4–0.5	0.4–0.6	0.9–1.2
	Summer	0.4–0.6	0.4–0.7	0.4–0.5	0.5–0.7	1.5–1.8
	Monsoon	0.2–0.4	0.4–0.7	0.2–0.4	0.1–0.4	0.5–1.5
	Post-monsoon	0.4–0.5	0.4–0.6	0.3–0.6	0.2–0.4	0.3–0.7
RCI	Winter	0.4–0.5	0.4–0.5	0.4–0.5	0.3–0.5	1.2–1.5
	Summer	0.4–0.5	0.4–0.5	0.3–0.5	0.3–0.5	1.2–1.8
	Monsoon	0.3–0.5	0.3–0.5	0.2–0.5	0.2–0.6	0.6–1.8
	Post-monsoon	0.3–0.5	0.3–0.5	0.4–0.6	0.4–0.6	0.7–2.0
Scale		< 0.1 = petrogenic  > 0.1 = pyrogenic	< 0.1 = petrogenic/unburned petroleum 0.4–0.5 = fossil fuel combustion  > 0.5 = biomass and coal combustion	< 0.2 = petrogenic 0.2–0.35 = petroleum combustion  > 0.35 = biomass and coal combustion	< 0.2 = petrogenic 0.2–0.5 = petroleum combustion  > 0.5 = biomass and coal combustion	< 0.6 = nontraffic  > 0.6 = traffic
References		Pies et al. 2008	De La Torre-Roche et al. (2009), Yunker et al (2002)	Yunker et al. (2002), Toblszewski and Namlesnik (2012)	Ravindra et al (2008)	Hussain et al.(2015)