Table 1.

Cross-validation summary statistics and semivariogram parameter estimates for PM₁₀ from three different spatial models, year 2000.

Model	Daysa	Mean	SD	Median	2.5th percentile	97.5th percentile
PE (μg/m3)
Exponential	366	0.2347	1.3212	0.0294	−0.6437	1.6690
Gaussian	366	−0.1097	1.0509	−0.1216	−1.1230	1.0020
Spherical	366	0.0629	1.1999	−0.0705	−0.7914	1.4810
RMSS
Exponential	366	1.8374	1.5431	1.1410	0.8638	6.0240
Gaussian	366	1.1709	0.9891	1.0070	0.8140	2.2660
Spherical	366	1.2549	0.7988	1.0270	0.8094	4.1550
SPE
Exponential	366	0.0118	0.0330	0.0036	−0.0274	0.1058
Gaussian	366	−0.0094	0.0333	−0.0071	−0.0418	0.0274
Spherical	366	−0.0011	0.0212	−0.0034	−0.0318	0.0470
Nugget (μg/m3)
Exponential	366	2,837.28	27,839.3	93.5230	0.0000	5,332.40
Gaussian	366	4,096.10	38,738.9	181.975	26.6230	7,466.20
Spherical	366	3,515.02	33,349.0	142.955	0.0000	7,143.10
Partial sill (μg/m3)
Exponential	366	7,957.38	91,589.2	258.515	49.1340	23,007.0
Gaussian	366	6,483.31	73,915.9	176.240	39.4570	23,716.0
Spherical	366	6,374.25	71,024.0	201.215	36.6550	22,736.0
Range (m)
Exponential	366	2,696,226	2,832,621	1,392,250	282,500	9,064,200
Gaussian	366	2,163,126	2,277,023	1,207,050	262,460	8,958,300
Spherical	366	2,447,936	2,375,933	1,424,050	280,820	8,958,300

^aDaily operating monitoring sites range from 148 to 1,061 sites.