Table 2:

Descriptive statistics for spatial determinants

Exposure group	Spatial determinant	Units	N	Mean (SD)	Median (IQR)	Coefficient of variation
Mass fraction	PM10 long-term average	μg/m3	267	22.42 (6.23)	23.53 (5.91)	0.25
	PM2.5 long-term average	μg/m3	312	12.59 (3.61)	12.55 (2.73)	0.22
	PM2.5-PM10 daily correlation		238	0.70 (0.25)	0.67 (0.18)	0.26
	PM ratio 2.5/10		267	0.55 (0.13)	0.56 (0.18)	0.24
Sources/emissions	PM2.5 dust construction	tons emitted/year	241	137 (321)	419 (944)	2.25
	PM2.5 dust paved road	tons emitted/year	312	301 (392)	513 (597)	1.16
	PM2.5 dust unpaved road	tons emitted/year	312	428 (822)	1,065 (2,022)	1.90
	PM2.5 fires wild	tons emitted/year	312	32 (248)	712 (3,089)	4.34
	PM2.5 fires prescribed	tons emitted/year	312	135 (727)	932 (2,389)	2.56
	PM2.5 fires agriculture field burning	tons emitted/year	312	9 (52)	70 (213)	3.06
	PM2.5 fires all	tons emitted/year	312	310 (1,527)	1,713 (4,339)	2.53
	PM2.5 dust all	tons emitted/year	312	1,062 (1,508)	1,997 (3,090)	1.55
	PM2.5 dust all and ag crops/livestock	tons emitted/year	312	1,570 (2,351)	2,699 (3,555)	1.32
	PM2.5 agriculture crops livestock	tons emitted/year	312	242 (782)	702 (1,125)	1.60
	VMT diesel total	megatons emitted/year	312	284 (408)	528 (727)	1.38
	VMT diesel per capita	tons emitted/year	312	882 (358)	921 (352)	0.38
	VMT gas total	megatons emitted/year	312	3,150 (5,418)	6,680 (9,801)	1.47
	VMT gas per capita	tons emitted/year	312	9,913 (2,594)	10,191 (1,886)	0.19
Components	PM2.5 ammonium	μg/m3	312	0.63 (0.40)	0.61 (0.28)	0.47
	PM2.5 nitrate	μg/m3	312	0.69 (0.64)	0.70 (0.36)	0.52
	PM2.5 sulfate	μg/m3	312	2.03 (0.93)	1.88 (0.68)	0.36
	PM2.5 elemental carbon	μg/m3	312	0.29 (0.11)	0.31 (0.10)	0.31
	PM2.5 organic carbon	μg/m3	312	0.94 (0.30)	0.94 (0.22)	0.23