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. 2024 Jul 30;31(37):49589–49600. doi: 10.1007/s11356-024-34482-5

Table 3.

Statistical summary for the water-soluble ions in PM_2.5 (μg m⁻³)

	Indoor			Outdoor
Variable	Mean ± std	Minimum	Maximum	Mean ± std	Minimum	Maximum
Na⁺	0.05 ± 0.04	0.01	0.16	0.18 ± 0.10	0.06	0.40
NH₄⁺	0.72 ± 0.47	0.20	2.07	1.17 ± 0.88	0.25	2.80
K⁺	0.02 ± 0.01	0.00	0.04	0.06 ± 0.03	0.02	0.15
Mg²⁺	0.03 ± 0.02	0.00	0.12	0.11 ± 0.05	0.05	0.23
Ca²⁺	0.69 ± 0.95	0.08	4.40	2.23 ± 1.06	0.64	4.38
Cl⁻	0.12 ± 0.10	0.03	0.39	0.24 ± 0.22	0.04	0.73
NO₃⁻	0.18 ± 0.12	0.04	0.51	0.69 ± 0.55	0.08	1.85
SO₄²⁻	2.92 ± 1.95	0.51	7.86	7.87 ± 4.82	2.55	19.67