Implications: This study provides an alternative approach to predict PM10 levels 1 day ahead by building seasonal ANN
models. Applying PCA on a lagged data set resulted in selection of the most significant lags of variables reducing model
complexity. Cascading training with error back-propagation method appropriately determined hidden layer neurons. Separately
building ANN models for winter and summer periods over years, even though it required much more effort compared with
building regular nonseasonal models, yielded better model agreements and smaller testing errors. This approach can be applied on
the data sets with irregularities and a large number of considered inputs.