. Author manuscript; available in PMC: 2012 Aug 1.

Published in final edited form as: Atmos Environ (1994). 2011 Aug 1;45(26):4412–4420. doi: 10.1016/j.atmosenv.2011.05.043

Table 3a.

Cross validated R² (RMSE) calculated for land use regression, universal kriging, and the 2-step approach for the ‘best’ model as chosen for predictive ability of land use regression in each season (on log(ppb) scale) for NOx

Season	Covariates	LUR	UK	2-step
Summer	D2A1, D2C, D2Comm, A23_50m, A1_50m, D2Lport, Int_3k	0.74 (0.20)	0.75 (0.19)	0.75 (0.19)
Autumn	D2A1, D2C, D2Comm, A23_50m, A1_50m, POP_5k	0.60 (0.20)	0.72 (0.17)	0.70 (0.17)
Winter	D2A1, D2C, A23_500m, D2R, Int_3k, D2Ryard	0.67 (0.17)	0.67 (0.17)	0.68 (0.17)