**4.3. Multiple models**

The same division of the dataset into three periods as in Section 3.3 is carried out. Since the day is analyzed into three independent parts, the dataset can be reduced to 12 features: minutes, %orange, %red, SR, T, P, rain, RH, WS, Xwind, Ywind, and PM2.5 (= feature to predict). The three datasets are composed of 110, 116, and 145 instances for the morning, midday, and afternoon models, respectively.
