Readings on 31 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)	30(30)	33(-)	17(7)	0.4(4)	17(57)
South	10(6)	30(30)	14(-)	27(12)	0.3(3)	19(59)
East	16(10)	27(27)	9(-)	27(12)	0.3(3)	19(59)
West	44(28)	32(32)	19(-)	19(8)	0.4(4)	20(60)
Central	5(3)	30(30)	16(-)	23(10)	0.2(2)	17(56)

1-hr PM_2.5 (µg/m³)^b Readings on 30 Aug 2015

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Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
North	14	12	25	14	22	14	16	21	19	25	22	29
South	31	25	23	30	19	23	23	23	14	17	29	28
East	20	29	25	24	25	17	19	20	23	16	26	30
West	18	26	21	24	20	18	20	27	23	28	40	34
Central	22	22	21	21	20	17	15	18	17	11	19	26
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
North	37	35	19	18	10	10	9	5	7	12	12	10
South	26	33	17	10	7	9	12	17	12	15	11	11
East	36	25	9	18	15	17	14	17	4	6	13	10
West	34	29	18	14	15	8	6	4	11	13	11	13
Central	32	33	17	13	16	8	14	4	7	9	12	7

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 30 Aug 2015

Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
3-hr PSI	61	61	62	63	62	60	59	59	60	60	62	66
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
3-hr PSI	71	72	67	60	53	51	47	43	40	39	43	45

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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