Table 2.

Seasonal mean OC and EC concentrations, and associated standard deviations, at the TACO and IMPROVE sites.

Site	Concentration (µg m−3)	W	S	PM	M	F
TACO	EC	0.69 ± 0.66	0.38 ± 0.38	0.27 ± 0.36	0.40 ± 0.34	0.54 ± 0.46
	OC	6.96 ± 3.40	5.05 ± 2.25	4.87 ± 1.98	4.40 ± 1.60	5.31 ± 2.20
SAGUARO NM	EC	0.15 ± 0.07	0.11 ± 0.05	0.10 ± 0.05	0.12 ± 0.04	0.13 ± 0.07
	OC	0.51 ± 0.18	0.50 ± 0.17	0.63 ± 0.33	0.63 ± 0.27	0.45 ± 0.20
SAGUARO WEST	EC	0.22 ± 0.13	0.12 ± 0.06	0.11 ± 0.05	0.13 ± 0.04	0.18 ± 0.08
	OC	0.61 ± 0.30	0.49 ± 0.17	0.74 ± 0.32	0.69 ± 0.28	0.55 ± 0.20