Fig. 5

Prediction of AQI class. The first subgraph shows three methods of predicting the AQL class by the composition model at the GH location. The second subgraph shows the results of three algorithms (CMG, SVR, NAR) for AQI class prediction by direct model at GH locality. The third subgraph shows the results of three algorithms (CMG, SVR, NAR) for AQI class prediction by composition model at JHS locality. The fourth subgraph shows the results of three algorithms (CMG, SVR, NAR) for AQI class prediction by direct model at JHS locality. The fifth subgraph shows the results of three algorithms (CMG, SVR, NAR) for AQI class prediction by composition model at ZKX locality. The sixth subgraph shows the results of three algorithms (CMG, SVR, NAR) for AQI class prediction by direct model at ZKX locality