Table 4.

Statistical summary for the metal species in PM_2.5 (ng m⁻³)

	Indoor			Outdoor
Variable	Mean ± std	Minimum	Maximum	Mean ± std	Minimum	Maximum
Al	612 ± 416	211	1804	2696 ± 1907	791	8310
Fe	314 ± 243	94	1055	1545 ± 1064	483	4843
Mn	6.3 ± 5.0	2.3	22.2	29.8 ± 19.8	9.3	88.6
Co	0.17 ± 0.16	0.05	0.67	0.86 ± 0.56	0.25	2.55
Cr	4.6 ± 3.3	1.6	13.7	9.5 ± 5.0	3.3	22.2
Ni	7.3 ± 4.2	2.9	17.6	13.6 ± 5.6	5.0	24.5
Cu	8.7 ± 8.0	1.8	33.0	9.0 ± 5.5	4.2	24.7
Zn	27.8 ± 14.6	13.4	83.9	49.5 ± 37.9	19.1	187.2
V	5.3 ± 2.8	2.2	11.9	15.2 ± 5.7	5.4	25.6
As	2.3 ± 1.1	1.1	5.2	3.0 ± 1.4	1.4	6.5
Pb	4.5 ± 2.0	2.4	11.0	9.1 ± 3.7	4.0	16.9
Cd	0.16 ± 0.07	0.16	0.35	0.23 ± 0.09	0.11	0.45