Readings on 24 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)	46(46)	30(-)	58(25)	0.4(4)	34(76)
South	11(7)	46(46)	16(-)	54(23)	0.5(5)	32(73)
East	13(8)	39(39)	8(-)	55(23)	0.4(4)	30(71)
West	24(15)	50(50)	18(-)	58(25)	0.5(5)	35(76)
Central	5(3)	43(43)	13(-)	66(28)	0.3(3)	28(69)

1-hr PM_2.5 (µg/m³)^b Readings on 23 Aug 2015

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Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
North	32	30	32	28	27	26	17	21	19	20	24	33
South	30	36	29	30	26	20	25	23	22	28	27	28
East	26	27	29	24	25	22	21	17	24	21	28	32
West	30	26	28	30	29	21	24	23	26	26	34	35
Central	34	26	28	24	21	22	14	23	22	21	22	31
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
North	42	62	62	67	63	48	39	30	20	21	24	33
South	39	42	65	46	38	44	40	26	16	24	30	34
East	40	52	45	39	36	32	32	26	26	29	31	26
West	48	46	62	62	44	45	43	31	34	24	28	29
Central	38	46	49	45	35	35	28	23	16	25	23	25

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 23 Aug 2015

Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
3-hr PSI	77	72	71	70	68	66	63	61	61	63	65	68
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
3-hr PSI	75	84	93	97	94	88	83	77	70	65	65	68

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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