Table 4: Estimated coefficients and standard errors of the parametric part of the additive predictors for PM10 (bold indicates 5% significance).

Est. Std. Er. (Intercept) 3.05 0.100 Daily traffic 0.00008 0.00001 Monday −0.01 0.059 Tuesday 0.09 0.062 Wednesday 0.11 0.060 Thursday 0.08 0.060 Friday 0.05 0.066 Saturday 0.06 0.053