Table 1.

Means (standard deviations) for pollutant concentrations and meteorological variables in each SOM category, Atlanta, GA, 1999 to 2008

SOM [X,Y]	CO (ppm)	NO2 (ppb)	NOx (ppb)	O3 (ppb)	SO2 (ppb)	PM2.5 EC (μg/m3)	PM2.5 OC (μg/m3)	PM2.5 NH4 (μg/m3)	PM2.5 NO3 (μg/m3)	PM2.5 SO4 (μg/m3)	PM10 (μg/m3)	PM2.5 (μg/m3)	TEMP (C)	DEWTMP (C)
[1, 1]	0.5 (0.3)	26.3 (7.8)	44 (23)	31.1 (11.9)	8.5 (8.5)	0.7 (0.3)	2.3 (0.8)	0.9 (0.4)	0.6 (0.4)	2.6 (1.1)	16 (6.5)	9.1 (2.9)	16.1 (7.6)	10.5 (9.1)
[1, 2]	1.1 (0.5)	45.1 (8.7)	119.7 (55.9)	35.1 (12.9)	10 (7.7)	1.2 (0.5)	3.6 (1.1)	0.9 (0.4)	0.9 (0.5)	2.6 (1.1)	20.3 (7.6)	11.9 (3.3)	14.4 (6.3)	6.6 (8.4)
[1, 3]	0.8 (0.5)	36.7 (9.4)	91.8 (54.8)	21.2 (10.8)	12.8 (12)	1.3 (0.6)	3.8 (1.8)	1.7 (0.7)	2.8 (1)	3.6 (1.7)	20 (8)	16.1 (6.1)	6.9 (5.3)	1.2 (7.8)
[2, 1]	0.7 (0.4)	34.1 (10.2)	58.3 (31.3)	56.2 (13.5)	9.5 (9)	1.2 (0.4)	3.7 (1)	2.2 (0.6)	0.5 (0.3)	6.7 (1.9)	28.2 (7.1)	18.7 (4.2)	24.2 (3.7)	17.1 (4.2)
[2, 2]	0.9 (0.6)	41 (10.5)	95.4 (57)	36.5 (16.1)	48.8 (17.1)	1.1 (0.6)	3.1 (1.1)	1.3 (0.6)	0.9 (0.6)	3.8 (2.1)	20.6 (8.1)	13.2 (5.3)	13.8 (8.9)	5.8 (10.5)
[2, 3]	2.4 (0.7)	53.3 (12.2)	308.8 (100.5)	30.9 (14.2)	18.4 (14)	2.6 (0.9)	6.1 (1.7)	1.1 (0.5)	1.3 (0.7)	3 (1.5)	27 (8.4)	18.6 (5.1)	11.9 (5.3)	3.4 (6.9)
[3, 1]	1.2 (0.5)	49.5 (13.4)	109.3 (59.2)	78.6 (18.5)	17.1 (14.3)	2 (0.7)	5.5 (1.7)	4.1 (1)	0.7 (0.4)	12.5 (2.9)	43.5 (9.9)	31.6 (5.8)	26.2 (3)	18.5 (2.9)
[3, 2]	1.4 (0.5)	57.7 (11.6)	158.8 (64.9)	64.7 (15.5)	12.9 (9.9)	2 (0.7)	5.4 (1.5)	2 (0.6)	0.7 (0.3)	5.6 (1.8)	33 (8.6)	20.6 (4.6)	21.7 (4.3)	12.6 (5.3)
[3, 3]	3.3 (0.9)	72.9 (20)	444.2 (130.2)	36.6 (19.7)	23.7 (16.3)	4.5 (1.5)	11 (3.9)	1.8 (1.2)	1.6 (0.9)	4.9 (3.2)	43.9 (16.9)	29.9 (9.6)	13.9 (5.5)	4.8 (7.4)
Overall	1.1 (0.8)	41 (15.8)	116.4 (109.1)	42.6 (21.3)	14.6 (15.1)	1.4 (1)	4 (2.3)	1.6 (1.1)	0.9 (0.8)	4.6 (3.2)	24.8 (11.7)	16.2 (7.9)	17.2 (8.1)	10 (9.1)