APPENDIX D AIR QUALITY MONITORING RESULTS

Site: Lamma Power Station Extension

Month: January 2023

24 hour TSP Measurement:-

Date	TSP concentration (mg/m^3)				Weather Information (From Hong Kong Observatory)
	Reservoir (AM1)	East Gate (AM2)	Ash Lagoon (AM3)	Tai Yuen Village (AM4)	Mean Wind Speed (km/hr)	Prevailing Wind Dir. (°)	Mean R.H. (%)
2/1/2023 5	57	46	39	32	21.8	20	65
8/1/2023	48	29	30	43	35.0	70	57
14/1/2023	17	24	5	17	9.4	250	90
20/1/2023	46	48	44	47	20.6	20	62
26/1/2023	49	27	40	38	26.8	60	66

1 hour TSP Measurement:-

Date	Time	TSP concentration (mg/m^3)
		Reservoir (AM1)	East Gate (AM2)	Ash Lagoon (AM3)
2/1/2023	15:00 - 15:59	63	109	69
	16:00 - 16:59	87	128	85
	17:00 - 17:59	108	77	68
8/1/2023	15:00 - 15:59	38	38	41
	16:00 - 16:59	53	47	45
	17:00 - 17:59	55	42	41
14/1/2023	15:00 - 15:59	22	17	3
	16:00 - 16:59	35	15	6
	17:00 - 17:59	14	28	0
20/1/2023	15:00 - 15:59	40	41	42
	16:00 - 16:59	73	46	40
	17:00 - 17:59	43	64	37
26/1/2023	15:00 - 15:59	37	14	36
	16:00 - 16:59	39	64	38
	17:00 - 17:59	47	45	35

1-hr TSP 24-hr TSP

(mg/m³) (mg/m³)

Action Level 340 190

Limit Level 500 260
Calibration: Calibration details are shown in appendix F.

Equipment used:

Location	1-hr TSP	24-hr TSP
Reservoir, East Gate and Ash Lagoon	TEOM	TEOM
Tai Yuen Village	-	MINIVOL Portable Sampler