Carbonaceous Aerosols in Fine Particulate Matter of Santiago Metropolitan Area, Chile

Table 2

Statistical hourly mass concentrations of PM_2.5, OC, EC, and TCA in 𝜇g m⁻³ at the three sampling sites.

Period	PM2.5	OC	EC	OC/EC	TCA	TCA/PM2.5
	Las Condes Station^c
All	27±17	8.6±5.3	2.0±1.8	6.1±5.0	12±6.8	0.48±0.19
Cool^a	32±21	11±6.1	2.7±2.1	5.9±5.8	15±7.9	0.49±0.19
Warm^b	22±11	6.3±2.6	1.3±1.0	6.3±3.9	9.2±3.4	0.47±0.19
	P. O’Higgins Station^c
All	35±27	11±9.3	4.2±5.3	4.8±4.3	17±14	0.50±0.63
Cool^a	47±33	16±11	6.6±6.3	3.4±2.5	24±16	0.57±0.85
Warm^b	23±12	5.5±2.8	1.5±1.5	6.2±5.2	8.6±3.9	0.41±0.18
	Pudahuel Station^c
All	34±31	11±13	3.6±5.8	6.0±6.3	17±18	0.47±0.19
Cool^a	47±39	18±16	6.1±7.5	4.9±5.2	26±23	0.52±0.19
Warm^b	21±12	5.4±3.7	1.3±1.4	7.1±7.0	8.3±4.8	0.42±0.18
	Average all stations
All	32±26	11±10	3.4±5.0	5.6±5.3	16±15	0.48±0.41
Cool^a	42±31	15±11	5.1±5.3	4.7±4.5	22±16	0.52±0.41
Warm^b	22±12	5.7±3.0	1.4±1.3	6.6±5.4	8.7±4.1	0.43±0.18

aCool seasons are winter and autumn (March to August).
bWarm seasons are spring and summer (September to February).
cLabel of the stations in Figure 1. Las Condes: C Label, P. O’Higgins: O Label, and Pudahuel: P Label.