Table 1.

B[a]P levels in outdoor air.

Location	Concentration [ng/m3]	Reference
The European Union	7% of EU citizens live in areas with a tolerable risk level of 0.12 ng/m3	[12]
France	1 ng to 2.49 ng/m3	[13]
Thailand	0.052 and 0.095 ng/m3 in PM 2.5 fraction	[14]
Iberian Peninsula	exceeded target value of 1 ng/m3	[15]
Italy—Genoa	2 ng/m3 (along heavy traffic streets)	[16]
	14 ng/m3 (300 m from a coke oven)
Poland—Cracow	4–10 ng/m3,	[17]
Tarnow	4–6 ng/m3
Nowy Sacz	10–11 ng/m3
China—Linzhou	5.1–20.2 ng/m3	[18]
Saudi Arabia—Makkah	0.082 ± 0.032 ng/m3 (occupationally exposed workers)	[10]
	0.044 ± 0.006 ng/m3 (unexposed group)