Table 4.

Multi-area LUR models for PM_2.5, PM_2.5 absorbance, PM₁₀, PM_coarse, PNC and LDSA

Pollutant	N	Model	Model			Measures of spatial autocorrelation		LOOCV
			Adj R2	R2	RMSE	P-value of association of residuals with area	Moran’s I (p-value)	R2	RMSE
PM2.5 (μg/m3)	74	PM2.5 = −13.2 + PM25_2010 * 1.81 + MAJROADLENGTH_25 * 0.0478 + URBGREEN_5000 * -0.000000521 + TRAFMAJOR * 0.0000515	0.55	0.57	2.0	0.4530	−0.0558 (0.7222)	0.50	2.2
PM2.5 absorbance (10−5 m−1)	74	PM2.5abs = 4.75 + Area_GE * 0.559 + Area_LU * 0.626 + Area_WA * 0.369 + MAJROADLENGTH_25 * 0.00564 + LOG_ALT * -0.715 + HEAVYTRAFLOAD_150 * 0.00000108	0.79	0.81	0.18	1.0000	0.1500 (0.1684)	0.77	0.19
PM10 (μg/m3)	74	PM10 = −19.2 + PM10_2010 * 2.02 + MAJROADLENGTH_25 * 0.0707 + URBGREEN_5000 * -0.00000092	0.62	0.63	2.5	0.1012	0.123 (0.2494)	0.59	2.6
PMcoarse (μg/m3)	74	PMcoarse = −0.69 + PM10_2010 * 0.337 + TRAFMAJORLOAD_75 * 0.000000413 + NATURAL_1000 * -0.00000182 +	0.43	0.45	1.5	0.0551	0.125 (0.242)	0.38	1.6
PNC (particles/cm3)	67	PNC = 7805 + Area_GE * 4270 + Area_LU * 5895 + Area_WA * ‘2388 + TRAFLOAD_250 * 0.000110 + ROADLENGTH_100 * 4.26 + MAJROADLENGTH_50 * 19.9 + UGNL_1000 * -0.00273	0.85	0.87	1991	1.0000	−0.0663 (0.7059)	0.82	2255
LDSA (μm2/cm3)	67	LDSA = 29.9 + Area_GE * 9.17 + Area_LU * 17.3 + Area_WA * 0.502 + MAJROADLENGTH_250 * 0.00317 + ROADLENGTH_100 * 0.0094 + TRAFNEAR * 0.000199 + ALT * -0.0257	0.89	0.91	3.8	1.0000	−0.0434 (0.8349)	0.87	4.2