Table 2.

Parameters of semivariogram model.

Parameter	Fitted Model	Nugget	Partial Sill	Lag Size (in degree)	Range(in degree)	MSE	RMSSE
Ozone
2005	Stable	0	29.78	0.32	3.79	−0.03	0.80
2006	Stable	0	30.11	0.08	0.66	−0.006	0.83
2007	Stable	9.66	16.72	0.08	0.67	0.001	0.77
PM2.5
2005	Stable	0.85	6.52	0.30	2.46	0.09	0.76
2006	Stable	0.72	7.68	0.34	2.70	0.07	0.68
2007	Stable	0.01	8.13	0.30	2.41	0.08	0.69
SO2
2005	Stable	0	31.79	0.17	1.38	0.00	0.83
2006	Stable	0	24.14	0.17	1.42	0.02	0.77
2007	Stable	21.49	13.22	0.26	2.14	−0.01	0.85