Readings on 01 Sep 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	5(3)	34(34)	29(-)	35(15)	0.4(4)	20(60)
South	10(6)	39(39)	17(-)	39(17)	0.4(4)	21(61)
East	16(10)	30(30)	9(-)	42(18)	0.3(3)	21(61)
West	28(17)	38(38)	26(-)	36(15)	0.3(3)	22(63)
Central	7(4)	35(35)	26(-)	37(16)	0.4(4)	17(57)

1-hr PM_2.5 (µg/m³)^b Readings on 31 Aug 2015

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Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
North	8	13	8	8	6	7	14	16	20	23	39	35
South	8	11	16	7	13	16	10	17	21	24	37	38
East	13	12	6	14	8	11	12	17	20	30	42	43
West	9	11	10	6	13	14	12	24	27	33	39	48
Central	8	6	8	8	6	11	10	20	22	22	34	35
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
North	38	41	32	20	30	28	26	26	24	7	9	5
South	38	40	30	19	26	19	20	17	19	19	14	15
East	43	35	25	25	26	25	19	15	10	12	13	17
West	43	40	35	34	34	19	20	14	14	14	19	7
Central	36	35	23	18	22	17	15	12	13	11	12	12

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 31 Aug 2015

Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
3-hr PSI	43	41	41	40	38	41	45	53	57	63	70	77
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
3-hr PSI	82	82	78	71	67	65	63	59	57	54	53	51

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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