Table 3.

Group-averaged PM elemental levels in μg/m ³

	Summer		Winter		Winter/Summer
Element (μg/m 3 )	CAPs	CAPs + O 3	CAPs	CAPs + O 3	Enrichment factor
Al	0.160	0.109	0.181	0.205	1.4
As	0.00249	0.00248	0.00159	0.00142	0.6
Ba	0.0513	0.0176	0.0263	0.0218	0.7
Ca	0.195	0.181	0.357	0.383	2.0
Cd	0.00041	0.00040	0.00072	0.00063	1.7
Co	0.00128	0.00034	0.00028	0.00048	0.5
Cr	0.00669	0.00784	0.00444	0.00351	0.5
Cu	0.143	0.0630	0.0536	0.0493	0.5
Fe	0.852	0.821	1.173	0.915	1.2
K	0.614	0.878	0.816	0.651	1.0
Li	0.00107	0.00204	0.00256	0.00194	1.4
Mg	0.0651	0.0475	0.1809	0.1543	3.0
Mn	0.0745	0.1203	0.1784	0.1352	1.6
Mo	0.00174	0.00117	0.00139	0.00071	0.7
Na	0.406	0.682	1.385	1.259	2.4
Ni	0.00301	0.00316	0.00378	0.00285	1.1
P	0.0526	0.0136	0.0184	0.0451	1.0
Pb	0.0225	0.0138	0.0173	0.0144	0.9
SO 4	46.7	51.5	18.9	14.6	0.3
Sb	0.00671	0.00488	0.00697	0.00579	1.1
Se	0.00488	0.00654	0.00395	0.00373	0.7
SiO 2	0.645	0.298	0.890	0.564	1.5
Sn	0.00568	0.00318	0.00521	0.00441	1.1
Sr	0.00238	0.00132	0.00301	0.00270	1.5
Ti	0.0237	0.0140	0.0219	0.0221	1.2
V	0.00165	0.00220	0.00337	0.00297	1.6
Zn	0.0619	0.0933	0.1158	0.1030	1.4
Organic C	48.43	59.75	35.19	32.61	0.6
Elemental C	2.46	4.43	3.87	3.18	1.0
OC/EC ratio	16.6		9.7