NOx Emission Factor(lb/min)	NOx Emission Rate (g)	NO2 Emission Rate(g/s)	NO2 Emission Rate(g/s)
Event	Ave. Time*(s)	(single engine)	(Twin Engine)	day time	night time
Approach	29.33	0.098	43.46	9.65706E-03	7.24280E-03
Hovering	30.00	0.098	44.44	9.87654E-03	7.40741E-03
Idling	673.50	0.006	61.09	1.35752E-02	1.01814E-02
Hovering	55.83	0.143	120.70	2.68218E-02	2.01163E-02
Take off	12.50	0.143	27.02	6.00487E-03	4.50365E-03
Total	801.17		296.71	6.59354E-02	4.94516E-02
Note:
Daytime: No. of Flight/hr/pad = 4 LTO
Night time: No. of Flight/hr/pad = 3 LTO
Flight schedule (daytime): 08:00-18:00
Flight schedule (night time): 18:01-22:59
*  The average time is estimated based on the survey conducted on 13 & 27 January, 23 March and 4 April 2005.