Results

Table shows only the best results obtained for different number of atmospheric variables.
The table shows 1-hr ahead predictions.

Used Variables	RMSE (PPB)	MAE(PPB)
SO₂	28.41	17.28
SO₂, WS SO₂, WD	28.40 29.06	17.23 16.97
SO₂, WS, WD	29.10	16.97
SO₂, WS, WD, T, RH	28.62	17.13

1-hr ahead predictions

Results for 1-hr Ahead SO2 Concentration Predictions:

Root Mean Squared Error (RMSE): 28.41 (PPB)
Mean Absolute Error (MAE): 17.98 (PPB)

Results for 1-hr ahead AQI Prediction:

Effectiveness Percentage = 86.26%.

Graphical results are shown in the attached figures.

Results for 12-hrs ahead predictions

Results for SO2 Concentration in Parts Per Billion:

Root Mean Squared Error (RMSE): 31.96 (PPB)
Mean Absolute Error (MAE): 16.95 (PPB)

Results for Air Quality Index of SO2:

Effectiveness Percentage: 89.43%

Graphical Results can be observed in the attached figures.

Results for 24-ahead Prediction

Results for SO2 Concentration Levels:

Root Mean Squared Error (RMSE): 37.27 (PPB)
Mean Absolute Error (MAE): 22.26 (PPB)

Results for Air Quality Index:

Effectiveness Percentage (EP): 86.64%.

Graphical Results can be observed in the attached figures.