Table 4.

Estimated parameters and standard errors for common model (on log(ppb) scale) for NOx. Details about the scaling of the covariates can be found in Table 1

Parameter	Summer	Autumn	Winter
Regression coefficient estimate (SE)
intercept	2.927 (0.25)	4.214 (0.25)	3.684 (0.25)
D2A1	−0.269 (0.04)	−0.161(0.04)	−0.137 (0.03)
A1_50m	−4.002 (7.02)	10.972 (5.37)	8.664 (4.26)
A23_400m	0.403 (0.28)	0.233 (0.22)	0.551 (0.19)
Pop_5k	−0.012 (0.03)	0.112 (0.03)	0.021 (0.03)
D2C	7.424 (0.69)	0.484 (0.92)	1.334 (1.03)
Int_3k	1.754 (0.77)	0.845 (0.76)	3.746 (0.88)
D2Comm	−1.507 (0.97)	−3.846 (0.80)	−2.071 (0.78)
Covariance
φ̂ (range in meters)	5,702	15,432	13,021
σ̂2 (partial sill)	0.030	0.016	0.027
τ̂2 (nugget)	0.011	0.023	0.010
Cross Validated R2(RMSE)
LUR	0.66 (0.22)	0.55 (0.19)	0.50 (0.21)
UK	0.70 (0.21)	0.68 (0.18)	0.72 (0.16)
2-step	0.70 (0.21)	0.66 (0.18)	0.70 (0.17)