Table 5.

Criteria for method selection.

$\mathrm{CMS}(R^2)$	LSVM	NLSVM	ANN
$\mathbf{CO}$	0.809	0.818	0.641
$\mathbf{HC}$	0.612	0.864	0.838
$\mathbf{N}{\mathbf{O}}_{\mathbf{x}}$	0.877	0.710	0.799
$\mathbf{C}{\mathbf{O}}_2$	0.884	0.944	0.725