Table 5.

Comparison of PAHs concentration in the non-heating period with heating period.

PAHs Number	Cities	Non-Heating Period (ng/m3)	Heating Period (ng/m3)	Reference
10	Zagreb, Croatian	0.54	41.2	[80]
15	Warsaw, Poland (Outdoor)	36.0	106	[81]
15	Warsaw, Poland (Indoor)	131	461	[81]
10	Delnice, Croatia (Rural)	0.80	48.5	[82]
10	Delnice, Croatia (Urban)	0.40	21.7	[82]
9	Rome, Italy	1.28	10.6	[83]
9	Augsburg, Germany	0.44	13.0	[84]