Readings on 11 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)	32(32)	31(-)	27(12)	0.4(4)	21(62)
South	9(6)	34(34)	20(-)	35(15)	0.4(4)	20(60)
East	13(8)	30(30)	11(-)	34(14)	0.4(4)	21(61)
West	31(19)	39(39)	36(-)	22(9)	0.4(4)	23(63)
Central	5(3)	32(32)	30(-)	33(14)	0.5(5)	17(57)

1-hr PM_2.5 (µg/m³)^b Readings on 10 Aug 2015

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

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 10 Aug 2015

Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
3-hr PSI	63	62	62	62	61	61	61	62	62	61	61	61
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
3-hr PSI	64	64	62	59	59	61	61	60	58	58	58	57

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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