A Machine Learning Approach to Predict Air Quality in California

Table 9

Forecasting models’ error metrics for ozone measurement in the training and validation sets.

Error metrics	PCA SVR-RBF		SVR-RBF
	Training set	Validation set	Training set	Validation set
MAE	0.083	0.190	0.041	0.088
R^2	0.987	0.923	0.996	0.982
RMSE	0.110	0.262	0.060	0.133
nRMSE	0.023	0.050	0.013	0.025