Predictive Ability of Improved Neural Network Models to Simulate Pollutant Dispersion

Table 1

Average meteorological parameters in Dhaka during 2004.

Season	Average values					Prevailing wind direction	% calm <1 m/s	% wind  (>2 m/s)
	Temp. (°C)		Rainfall	Relative humidity	Wind speed
	Max.	Min.	(mm)	(%)	(m/s)
Winter	28	12	65	70	0.9	NW	72	9
Premonsoon	35	22	515	72	1.7	S, SW	28	42
Monsoon	30	27	1198	82	1.5	S, SE	27	36
Postmonsoon	30	21	225	77	0.7	W, SW	69	8

Winter: Dec.–Feb.; premonsoon: March–May; monsoon: June–Sept.; postmonsoon: Oct.-Nov.