Readings on 22 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	4(2)	38(38)	56(-)	25(11)	0.5(5)	26(67)
South	23(14)	42(42)	53(-)	25(11)	0.7(7)	30(71)
East	15(10)	39(39)	25(-)	21(9)	0.4(4)	28(70)
West	15(9)	42(42)	57(-)	27(11)	0.4(4)	28(69)
Central	17(11)	39(39)	61(-)	26(11)	0.5(5)	27(68)

1-hr PM_2.5 (µg/m³)^b Readings on 21 Aug 2015

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Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
North	23	15	9	24	23	23	13	24	31	22	33	27
South	22	12	17	24	20	13	25	17	24	29	32	30
East	17	12	22	17	19	20	25	27	27	30	33	37
West	36	47	44	35	33	41	13	25	36	39	28	16
Central	24	18	14	17	16	17	18	26	31	28	26	30
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
North	19	15	33	35	29	40	48	37	29	22	23	28
South	16	36	42	29	52	49	44	42	37	25	27	43
East	12	38	41	34	50	51	39	18	32	28	29	26
West	22	32	25	30	32	25	20	19	25	11	17	23
Central	13	40	30	34	47	40	36	34	27	26	25	38

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 21 Aug 2015

Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
3-hr PSI	70	65	62	62	63	63	61	62	65	69	71	70
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
3-hr PSI	65	66	69	75	78	81	83	78	74	68	66	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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