Table 2.

Concentration of PCBs in indoor environments in different settings.

Settings	Location	Sample/Sampling Area	Concentration	Dominant Congeners	Reference
Workplace	Hong Kong, China	Air-conditioner filter dust	Σ37PCBs: 46.8–249 ng/g	PCB-77, 194, and 199	[76]
	Abraka and Warri, Nigeria	Indoor dust at electronic repair workshop	Σ28 PCB: 96.6–3949 ng/g	Hexa-PCB	[77]
	Durban, South Africa	Dust	Σ3PCBs: 235 ng/g	-	[78]
	North-Rhine Westphalia, Germany	Air	Σ28PCB: 92–2797 ng/m3	PCB-28, 52 and 101	[75]
	France	Air	Σ19PCB: 1.75 ± 1.82 ng/m3	-	[79]
Resident	Vietnam	Settled dust	Σ209 PCB: 11–1900 ng/g	-	[80]
	Canada	Air	Σ7PCB: 455 pg/m3	-	[64]
	Czech Republic	Air and dust	Σ7PCB: 467 pg/m3 (air); 75.1 ng/g (dust)	-	[64]
	Kopawa, Nepal	Dust	Ʃ30PCBs: 9.64–16.5 ng/g	Tetra-PCBs followed by penta, hexa, and hepta-CBs	[81]
	Brno, Czech Republic	Air	Σ7PCB: 89 pg/m3 (summer); 61 pg/m3 (winter)	Tri-tetra, and hepta-hexa PCBs	[82]
	Belgium, Italy, Spain, and Portugal	Air	Σ7PCBs: 306 pg/m3	PCB-28, 52 and 101	[83]
	Farum, Denmark	Air	Ʃ24PCBs: 168–3843 ng m3	PCB-28 and 52	[84]
	Bursa, Turkey	Air	Σ40PCBs	Penta-, tetra- and tri-CBs	[63]
			Living rooms: 604 ± 210 pg/m3 (summer); 362 ± 167 pg/m3 (autumn) Kitchens: 639 ± 2514 pg/m3 (summer); 309 ± 93 pg/m3 (autumn)
	Brondby Strand Parkerne, Denmark	Air, vacuum cleaner dust, and surface wipes	Σ15PCB: 2330 ng/m3 (air); 12.000 ng/g (dust); 529 ng/wipe (surface wipes)	Tri- and Tetra PCBs	[69]
	Thessaloniki, Greece	Dust	Σ15PCBs: 3.04–9.68 ng/g	PCB-52, 28 + 31 and 101	[85]
	Lahore, Pakistan	Dust	∑35 PCB: 0.27–152.9 ng/g	Tri- and Tetra PCBs	[86]
	Hai Phong city and Hung Yen province, Vietnam	Air and Dust	PCBs level in dust: 3.6–320 ng/g PCBs level in air: 1000–1800 pg/m3	In dust: penta- and hexaCBs In air: triCBs	[87]
School	United States	Air	100–276 ng/m3	-	[88]
	United States	Air	0.5–194 ng/m3		[49]
	West Midlands, U.K.	Dust	Σ8PCBs: 1.2–560 ng/g		[89]
	Indiana and Iowa, United States		0.5–194 ng/m3	-	[49]
	Iowa, United States	Air	1.54–35.75 ng/m3	-	[90]