Table 4

Median Spearman R and regression slopes of the relation between personal, indoor, and outdoor concentrations in Amsterdam and Helsinki

	Amsterdam			Helsinki
	Personal-outdoor (n = 36)	Indoor-outdoor (n = 35)	Personal-indoor (n = 35)	Personal-outdoor (n = 46)	Indoor-outdoor (n = 45)	Personal-indoor (n = 45)
Spearman r
PM_2.5	0.76	0.79	0.84	0.74	0.80	0.90
Abs	0.91	0.94	0.94	0.89	0.89	0.90
S	0.96	0.96	1.00	0.90	0.90	0.95
Zn	0.89	0.94	0.93	0.70	0.77	0.86
Fe	0.71	0.89	0.80	0.70	0.70	0.71
Ni	NA	0.71	NA	NA	0.60	NA
Mn	NA	0.89	NA	NA	0.50	NA
V	NA	0.60	NA	NA	0.60	NA
K	0.70	0.77	0.86	0.55	0.70	0.90
Ca	0.52	0.60	0.64	0.30	0.60	0.70
Cu	0.27	0.21	0.67	0.25	0.10	0.57
Si	0.36	0.26	0.49	0.70	0.71	0.89
Cl	0.52	0.60	0.81	0.30	0.30	0.80
Slope
PM_2.5	0.46	0.46	0.95	0.48	0.53	0.93
Abs	0.95	0.83	1.08	0.61	0.60	1.02
S	0.65	0.79	0.82	0.40	0.52	0.78
Zn	0.55	0.64	0.80	0.37	0.42	0.88
Fe	0.65	0.68	0.89	0.47	0.44	0.94
Ni	NA	0.44	NA	NA	0.38	NA
Mn	NA	0.69	NA	NA	0.36	NA
V	NA	0.47	NA	NA	0.35	NA
K	0.60	0.79	0.69	0.55	0.51	0.79
Ca	0.73	0.55	0.81	0.64	0.50	1.05
Cu	0.16	0.32	0.59	0.20	0.01	0.80
Si	0.39	0.62	0.74	0.35	0.47	0.73
Cl	0.53	0.60	0.93	0.00	0.08	0.31