Readings on 20 Aug 2015

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Region	24-hr Sulphur dioxide (µg/m³)	24-hr PM₁₀ (µg/m³)	1-hr Nitrogen dioxide (µg/m³)^a	8-hr Ozone (µg/m³)	8-hr Carbon monoxide (mg/m³)	24-hr PM_2.5 (µg/m³)
North	6(4)	45(45)	50(-)	32(13)	0.5(5)	27(68)
South	16(10)	43(43)	30(-)	31(13)	0.6(6)	27(68)
East	15(10)	36(36)	10(-)	38(16)	0.8(8)	27(67)
West	52(32)	53(52)	49(-)	31(13)	0.6(6)	34(76)
Central	12(7)	40(40)	35(-)	39(17)	0.4(4)	24(64)

1-hr PM_2.5 (µg/m³)^b Readings on 19 Aug 2015

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Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
North	9	15	16	9	15	9	11	21	25	25	30	25
South	13	13	14	12	19	18	16	18	18	19	18	26
East	14	10	16	17	14	19	16	10	12	18	26	26
West	18	10	17	22	14	16	9	23	21	11	27	28
Central	9	15	18	15	13	15	14	17	17	14	16	17
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
North	32	38	42	44	40	36	44	60	49	22	16	18
South	29	33	36	41	34	45	69	38	27	43	31	27
East	33	37	39	40	36	42	63	48	29	32	23	19
West	37	38	42	45	44	52	96	98	60	34	32	27
Central	33	32	35	38	33	36	53	35	23	27	26	21

Note:
^a Sub-index for nitrogen dioxide is reported only when the 1-hour concentration exceeds 1130 µg/m³.
^b There is no sub-index for 1-h PM_2.5.

3-hr PSI Readings from 1am to 12am on 19 Aug 2015

Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
3-hr PSI	53	52	53	54	55	55	54	55	56	58	60	62
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
3-hr PSI	68	72	78	81	82	83	92	99	97	85	73	67

The real-time data is automatically published as soon as it is generated by our air monitoring stations. The data is subject to verification and correction subsequently if necessary.

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