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Table 4 Statistical scores of a meta-model approximation trained on \(N_{train} = 3000\) compared to the scores of the model chain using the full air quality model

From: Meta-modeling of a simulation chain for urban air quality

State Estimation \(c({\mathbf {p}})\) vs. \({\hat{c}}({\mathbf {p}})\) (\(N_{train} = 3000\))

Statistical scores over 1-month simulations

Over the full grid

MNRMSE (14)

\(\sqrt{\text {NMSE}}\) (11)

Correlation (12)

Meta-model vs. full model chain

0.35

0.30

0.91

At receptor locations

NRMSE (10)

\(\sqrt{\text {NMSE}}\) (11)

Correlation (12)

Meta-model vs. full model chain

0.30

0.24

0.94