Table 3.

Weekly time-weighted average indoor and outdoor concentrations of air pollutants at reference locations (μg/m³).

Substance	Week No.	Helicopter Platform		Dentistry Building		Kindergarten
	Type	Indoor	Outdoor	Indoor	Outdoor	Indoor	Outdoor
	Description	Seventh Floor	Under Platform	Front Desk	Court Yard	Office FirstFloor	Terrace First Floor
Acrolein	1	0.17	0.14	0.24	<0.001	0.17	- a
	2	0.15	0.08	0.32	0.09	0.19	- a
Formaldehyde	1	9.7	2.6	7.7	2.0	8.3	- a
	2	9.9	2.9	10.2	2.6	8.4	- a
Nitrogen dioxide	1 + 2	11.8	15.5	15.3	17.4	8.63	15.6
TVOC	1	159	12.8	311	1.6	312	<0.1
	2	166	11.2	281	<0.1	21.5	<0.1
PM-4.0	1	6.4	3.7	8.4	13.3	6.4	5.9
	2	5.4	28.3	12.4	25.3	14.2	5.6
PM-2.5	1	-	-	4.6	11.1	-	-
	2	-	-	9.8	25.7	-	-
Benz(a)pyrene b	1	2.3 × 10−5	2.5 × 10−5	7.3 × 10−5	7.7 × 10−5	3.0 × 10−5	1.9 × 10−5
	2	5.5 × 10−5	1.5 × 10−4	1.1 × 10−4	1.4 × 10−4	1.2 × 10−4	2.7 × 10−5

^a No result due to technical difficulties (DNPH impregnated adsorbent material was wetted due to heavy rainfall); ^b B(a)P was analyzed from an extract of PM-4.0.