Annex D1 - Traffic Emission Assessment

ANNEX D1
Traffic Emission Assessment

Table D1 : Detail Traffic Data and Associated Traffic Emission Calculation

Whitehead & Lee On Development ENVIRONMENTAL ASSESSMENT (Year 2023 Traffic Flow)

Calculation of Emission Rates of all types of vehicles for CALINE4 Tony Cheng

Based on EPD traffic control, MOBILE4 model's emission factor

Fleet Average Particulates Emission Factors, gm/km

Year	Pc-p	Taxi	PuBus	PrBus	PuLB	LGV-dil	MGV	HGV
2011	0.03	0.01	0.69	0.5	0.12	0.11	0.53	0.53

Fleet Average NOx Emission Factors, gm/km

Year	Pc-p	Taxi	PuBus	PrBus	PuLB	LGV-dil	MGV	HGV
2011	0.71	0.73	6.8	5.54	1.54	1.23	3.84	3.84

Road	% P.Car	% Taxi	% PuBus	% PrBus	% PuLB	% LGV	% Medium	% Heavy	RSP *	NOx *	Total
									gm/v-km	gm/v-km	veh/hr
A	55.6	16.7	0.0	5.6	0.0	11.1	5.6	5.6	1.1722	13.8722	180
B	50.0	14.3	0.0	7.1	0.0	14.3	7.1	7.1	1.4357	15.7929	140
D3	60.9	13.0	4.3	2.2	2.2	10.9	2.2	4.3	1.0957	13.6109	460
D2	59.0	12.8	5.1	2.6	2.6	10.3	2.6	5.1	1.2231	14.6410	390
D4	64.3	16.3	0.0	2.3	0.0	10.1	2.3	4.7	0.8062	10.9636	1290
F	68.8	12.5	0.0	6.3	0.0	6.3	0.0	6.3	0.9313	12.4250	160
G	63.2	10.5	10.5	5.3	0.0	5.3	0.0	5.3	1.5263	17.9947	190
D1	55.6	13.3	6.7	2.2	6.7	8.9	2.2	4.4	1.2822	15.3622	450
D5	66.7	16.7	0.0	0.0	0.0	16.7	0.0	0.0	0.4000	8.0000	60
SS5	54.9	13.7	7.8	3.9	3.9	8.8	2.0	4.9	1.4235	16.7304	1020
SS6	55.9	14.0	8.6	3.2	3.2	8.6	2.2	4.3	1.4118	16.6591	930
K	56.6	10.9	11.6	2.3	3.9	7.8	2.3	4.7	1.6008	18.2349	1290
SS3	63.8	14.5	2.6	2.6	1.3	9.2	2.0	3.9	0.9500	12.4441	1520
SS4	63.2	13.6	3.2	2.4	1.6	9.6	2.4	4.0	1.0080	12.8704	1250
SS2	64.5	13.2	2.6	2.6	2.6	9.2	1.3	3.9	0.9316	12.3447	760
SS1	66.5	11.7	0.8	2.9	0.6	10.5	2.3	4.6	0.9040	11.8046	4780
T7S6	65.1	11.6	4.7	2.3	0.0	9.3	2.3	4.7	1.1163	13.7465	430
T7S5	60.9	13.0	0.0	6.5	0.0	6.5	6.5	6.5	1.2848	14.6978	460
T7S2	69.9	12.9	0.0	2.2	0.0	8.6	2.2	4.3	0.7667	10.6312	930
T7S1	66.7	13.8	1.1	2.3	0.6	9.2	2.3	4.0	0.8511	11.4425	1740
T73	68.1	10.6	0.0	3.0	0.0	10.9	2.4	4.9	0.8739	11.4416	3290
T7S4	61.6	15.1	2.7	2.7	1.4	9.6	2.7	4.1	1.0110	12.8781	730
T7S3	63.0	14.8	2.5	2.5	1.2	9.9	2.5	3.7	0.0948	12.3741	810
T76	62.9	12.4	2.2	4.5	0.0	7.9	4.5	5.6	1.2034	14.2382	890
T72	66.9	11.4	0.5	3.0	0.2	10.7	2.5	4.7	0.8988	11.7025	4020
T745	67.6	11.2	0.7	2.9	0.4	10.0	2.9	4.5	0.9071	11.7704	5610

Table D3 : Predicted Air Pollutants Conc. at rASRs within Study Area from Traffic Emission

		NO₂¹		RSP²
ASR	Floor	1hr	24hr	24hr
1	1	90.0	75.0	63.3
	6	82.5	70.4	61.8
	12	75.0	65.9	60.1
2	1	101.3	81.7	66.3
2	3	101.3	81.7	66.7
3	1	93.8	77.2	64.6
3	3	97.5	79.5	65.4
4	1	108.8	86.2	68.2
	4	112.6	88.5	68.7
	7	108.8	86.2	67.4
5	1	82.5	70.4	62.4
5	3	82.5	70.4	61.9
6	1	86.2	72.7	62.8
	5	82.5	70.4	61.8
	10	75.0	65.9	60.1
	20	63.7	59.2	57.4
	30	56.2	54.7	56.2
7	1	82.5	70.4	61.6
	5	75.0	65.9	60.6
	10	67.4	61.4	59.5
	20	63.7	59.2	57.4
	30	59.9	56.9	56.1
	40	52.4	52.4	55.5
8	50	52.4	52.4	55.2
	1	86.2	72.7	62.5
	5	78.7	68.2	61.4
	10	71.2	63.7	60.0
	20	63.7	59.2	57.5
	30	59.9	56.9	56.1
	40	52.4	52.4	55.5
	50	52.4	52.4	55.2
9	1	93.8	77.2	64.6
	5	90.0	75.0	63.4
	10	75.0	65.9	60.7
	20	63.7	59.2	57.5
	30	59.9	56.9	56.0
	40	52.4	52.4	55.5
	50	52.4	52.4	55.2
10	1	78.7	68.2	61.3
	5	71.2	63.7	59.9
	10	71.2	63.7	58.7
	20	63.7	59.2	57.2
	30	56.2	54.7	56.1
	40	52.4	52.4	55.5
	42	52.4	52.4	55.4
11	1	82.5	70.4	62.0
	5	75.0	65.9	60.6
	10	71.2	63.7	59.3
	20	63.7	59.2	57.7
	30	59.9	56.9	56.6
	37	56.2	54.7	56.0

		NO₂¹		RSP²
ASR	Floor	1hr	24hr	24hr
12	1	78.7	68.2	61.5
	5	75.0	65.9	60.5
	10	71.2	63.7	59.4
	20	63.7	59.2	57.6
	30	56.2	54.7	56.5
	37	56.2	54.7	56.0
13	1	78.7	68.2	61.8
13	3	78.7	68.2	61.5
14	1	75.0	65.9	60.1
14	3	71.2	63.7	59.9
15	1	78.7	68.2	61.5
15	3	78.7	68.2	61.2
16	1	71.2	63.7	59.7
16	3	71.2	63.7	59.7
17	1	75.0	65.9	60.2
17	3	75.0	65.9	60.1
18	1	78.7	68.2	61.5
	5	78.7	68.2	60.4
	10	67.4	61.4	59.1
	20	63.7	59.2	57.2
	30	59.9	56.9	56.3
19	1	67.4	61.4	58.4
	5	67.4	61.4	58.0
	10	63.7	59.2	57.5
	20	59.9	56.9	56.8
	22	59.9	56.9	56.3
20	1	67.4	61.4	57.9
	5	67.4	61.4	57.8
	10	63.7	59.2	57.5
21	1	63.7	59.2	58.2
22	1	63.7	59.2	58.2
23	1	63.7	59.2	58.2
	3	63.7	59.2	57.8
	7	59.9	56.9	57.5
24	1	63.7	59.2	58.2
24	4	63.7	59.2	57.9
25	1	67.4	61.4	58.9
25	3	67.4	61.4	58.5
26	1	78.7	68.2	60.6
	3	75.0	65.9	60.1
	6	71.2	63.7	59.1
27	1	67.4	61.4	58.6
	3	67.4	61.4	58.5
	6	67.4	61.4	58.3
28	1	75.0	65.9	59.7
	5	71.2	63.7	58.8
	10	67.4	61.4	58.0

		NO₂¹		RSP²
ASR	Floor	1hr	24hr	24hr
29	1	75.0	65.9	59.8
	5	82.5	70.4	61.6
	10	82.5	70.4	61.4
	20	75.0	65.9	60.0
	22	82.5	70.4	62.4
30	1	90.0	75.0	64.3
30	3	86.2	72.7	63.3
31	1	120.1	93.0	71.4
	5	116.3	90.8	70.0
	10	108.8	86.2	68.3
	20	97.5	79.5	65.3
	30	75.0	65.9	59.7
32	1	108.8	86.2	67.7
	5	97.5	79.5	65.0
	10	86.2	72.7	62.9
	20	71.2	63.7	59.8
	30	63.7	59.2	57.5

Note :

1 - NO₂ Background 52.4 µg/m³ is included; 1 hr AQO is 300 µg/m³, 24hr AQO is 150 µg/m³

2 - RSP Background 55.0 µg/m³ is included; 24 hr AQO is 180 µg/m³

Annex D1 : Calculation of the Portal Emission Factors - Sunking Road at Road L1

Traffic flow of the Road A - B
Veh	% P.Car	% Taxi	% PuBus	% PrBus	% PuLB	% LGV	% Medium	% Heavy
180	55.6	16.7	0	5.6	0	11.1	5.6	5.6

Emission Factors in 2011 (gm/km) supplied by the Vehicle Emission Control Section of EPD
	P.Car	Taxi	PuBus	PrBus	PuLB	LGV	Medium	Heavy
NOx	0.71	0.73	6.8	5.54	1.54	1.23	3.84	3.84
RSP	0.03	0.01	0.69	0.5	0.12	0.11	0.53	0.53

Emission Factor for NOx				Emission Factor for RSP
Road	g/km/veh			g/km/veh
A-B	1.39352			0.11792

Portal Effect along Southern Decking
Length of the tunnel (km)			=	0.08
Half length of the tunnel (km)			=	0.04
Traffic flow (veh/hr)			=	180

Emission Rate of NOx in tunnel			=	E.F. of the road * traffic flow * length of the tunnel
			=	1.39 * 180 * 0.04
			=	10.033344	g/hr
			=	0.00278704	g/s
Emission Rate of RSP in tunnel			=	E.F. of the road * traffic flow * length of the tunnel
			=	0.11792 * 180 * 0.04
			=	0.849024	g/hr
			=	0.00023584	g/s
According to PIARC 91, pollutant is assumed to emit completely out of the tunnel and each portal
emit half of the total mass. For each portal, 2/3 and 1/3 of the emitted mass are assumed to accumulate
in the first and second 50m respectively

Therefore,

Emission Rate of NOx in the 1st 50m =				Emission Rate of NOx * 2/3
				6.688896	g/hr

Emission Rate of NOx in the 2nd 50m =				Emission Rate of NOx * 1/3
				3.344448	g/hr

Assume 20% of NOx will be converted to NO2
NOx emission rate of the 1st 50m =				0.001858027	g/s
NO2 emission rate of the 1st 50m				0.00037161	g/s

NOx emission rate of the 2nd 50m =				0.000929013	g/s
NO2 emission rate of the 2nd 50m				0.00018580	g/s

Emission Rate of RSP in the 1st 50m =				Emission Rate of RSP * 2/3
			=	0.566016	g/hr

Emission Rate of RSP in the 2nd 50m =				Emission Rate of RSP * 1/3
			=	0.283008	g/hr

RSP emission rate of the 1st 50m =				0.000157227	g/s
RSP emission rate of the 2nd 50m =				7.86133E-05	g/s