Lamma Power Station Extension - Air Quality Monitoring Data for unit L13 (Construction)
24-hr TSP (µg/m^3)					1-hr TSP (µg/m^3)
Date	Reservoir (AM1)	East Gate (AM2)	Ash Lagoon (AM3)	Tai Yuen Village (AM4)	Date	Time	Reservoir (AM1)	East Gate (AM2)	Ash Lagoon (AM3)
3/4/2025	45	53	47	7	3/4/2025	15:00 - 15:59	49	140	43
9/4/2025	46	42	35	14		16:00 - 16:59	48	147	41
15/4/2025	249^	256^	205^	163		17:00 - 17:59	44	57	37
21/4/2025	36	22	18	25	9/4/2025	15:00 - 15:59	28	29	27
27/4/2025	26	23	22	31		16:00 - 16:59	24	32	26
						17:00 - 17:59	26	33	25
	^ - Action level exceedances of 24-hour TSP were recorded at AM1 to AM3 on 15 April 2025. According to the information from EPD, the high dust episode was due to the influence of a dusty air stream associated with the northeast monsoon and all EPD monitoring stations also recorded daily AQO exceedance for RSP. As such, we are of the view that the 24-hour action level exceedances are non-project related.				16/4/2025	15:00 - 15:59	226	228	177
						16:00 - 16:59	220	231	195
						17:00 - 17:59	266	243	219
					21/4/2025	15:00 - 15:59	27	20	17
						16:00 - 16:59	87	21	17
						17:00 - 17:59	124	20	15
					27/4/2025	15:00 - 15:59	23	22	21
						16:00 - 16:59	21	21	21
						17:00 - 17:59	22	21	22
Lamma Power Station Extension - Air Quality Monitoring Data for unit L9 (Operation)
Date	Daily Maximum Stack NOx concentration (mg/Nm^3)^#
1/4/2025	77
2/4/2025	77
3/4/2025	81
4/4/2025	*
5/4/2025	*
6/4/2025	*
7/4/2025	80
8/4/2025	77
9/4/2025	73
10/4/2025	79
11/4/2025	79
12/4/2025	79
13/4/2025	*
14/4/2025	78
15/4/2025	76
16/4/2025	72
17/4/2025	70
18/4/2025	*
19/4/2025	75
20/4/2025	75
21/4/2025	74
22/4/2025	71
23/4/2025	72
24/4/2025	76
25/4/2025	78
26/4/2025	78
27/4/2025	79
28/4/2025	74
29/4/2025	78
30/4/2025	79
Note:
# - Hourly average value. Expressed as at 0°C, 101.325kPa, dry and corrected to 15% O2 condition. ^ - The NOx concentration exceeded action level due to low relative humidity.
* - Unit L9 was not on load.
Lamma Power Station Extension - Air Quality Monitoring Data for unit L10 (Operation)
Date	Daily Maximum Stack NOx concentration (mg/Nm^3)^#
1/4/2025	*
2/4/2025	*
3/4/2025	*
4/4/2025	*
5/4/2025	*
6/4/2025	4
7/4/2025	3
8/4/2025	8^
9/4/2025	3
10/4/2025	3
11/4/2025	3
12/4/2025	3
13/4/2025	3
14/4/2025	3
15/4/2025	3
16/4/2025	4
17/4/2025	3
18/4/2025	3
19/4/2025	3
20/4/2025	3
21/4/2025	3
22/4/2025	3
23/4/2025	3
24/4/2025	3
25/4/2025	3
26/4/2025	3
27/4/2025	3
28/4/2025	3
29/4/2025	3
30/4/2025	3
The daily maximum stack NOx concentration complies with the Action/Limit Level for all unit loading ranges. Note: # - Hourly average value. Expressed as at 0°C, 101.325kPa, dry and corrected to 15% O2 condition. * - Unit L10 was not on load. ^ - Unit L10 was operating with loading less than 266 MW.
Lamma Power Station Extension - Air Quality Monitoring Data for unit L11 (Operation)
Date	Daily Maximum Stack NOx concentration (mg/Nm^3)^#
1/4/2025	7^
2/4/2025	5^
3/4/2025	5^
4/4/2025	5^
5/4/2025	4^
6/4/2025	4^
7/4/2025	*
8/4/2025	*
9/4/2025	*
10/4/2025	*
11/4/2025	*
12/4/2025	*
13/4/2025	*
14/4/2025	*
15/4/2025	*
16/4/2025	*
17/4/2025	*
18/4/2025	*
19/4/2025	*
20/4/2025	*
21/4/2025	*
22/4/2025	*
23/4/2025	*
24/4/2025	*
25/4/2025	*
26/4/2025	*
27/4/2025	*
28/4/2025	*
29/4/2025	*
30/4/2025	*
The daily maximum stack NOx concentration complies with the Action/Limit Level for all unit loading ranges. Note: # - Hourly average value. Expressed as at 0°C, 101.325kPa, dry and corrected to 15% O2 condition. * - Unit L11 was not on load. ^ - Unit L11 was operating with loading less than 266 MW.
Lamma Power Station Extension - Air Quality Monitoring Data for unit L12 (Operation)
Date	Daily Maximum Stack NOx concentration (mg/Nm^3)^#
1/4/2025	4
2/4/2025	4
3/4/2025	4
4/4/2025	4
5/4/2025	4
6/4/2025	4
7/4/2025	4
8/4/2025	4
9/4/2025	4
10/4/2025	4
11/4/2025	4
12/4/2025	3
13/4/2025	4
14/4/2025	4
15/4/2025	4
16/4/2025	4
17/4/2025	4
18/4/2025	4
19/4/2025	4
20/4/2025	3
21/4/2025	3
22/4/2025	4
23/4/2025	4
24/4/2025	4
25/4/2025	4
26/4/2025	4
27/4/2025	5^
28/4/2025	4
29/4/2025	5^
30/4/2025	5^
The daily maximum stack NOx concentration complies with the Action/Limit Level for all unit loading ranges. Note: # - Hourly average value. Expressed as at 0°C, 101.325kPa, dry and corrected to 15% O2 condition. * - Unit L12 was not on load. ^ - Unit L12 was operating with loading less than 266 MW.