Readings on 14 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	7(5)	36(36)	38(-)	21(9)	0.3(3)	21(61)
South	32(20)	28(28)	29(-)	20(9)	0.5(5)	17(57)
East	18(11)	23(23)	24(-)	15(6)	0.4(4)	17(56)
West	28(17)	39(39)	41(-)	16(7)	0.4(4)	23(63)
Central	14(9)	27(27)	42(-)	18(8)	0.6(6)	16(55)

1-hr PM_2.5 (µg/m³)^b Readings on 13 Aug 2015

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Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
North	15	25	20	22	27	32	27	28	16	23	34	27
South	14	16	18	26	23	29	24	17	23	19	24	17
East	13	18	16	23	23	22	28	28	27	20	24	14
West	27	27	24	23	27	30	28	37	30	35	29	28
Central	20	18	15	15	20	24	25	22	29	22	12	23
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
North	27	25	26	18	18	14	13	10	8	15	16	21
South	18	20	19	12	12	14	14	8	13	7	6	16
East	15	17	16	9	19	6	15	9	9	8	13	9
West	27	27	29	23	21	17	10	9	6	10	9	15
Central	14	18	21	8	7	9	11	6	11	10	8	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 13 Aug 2015

Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
3-hr PSI	55	57	59	60	62	65	67	67	66	66	65	64
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
3-hr PSI	62	61	61	59	57	53	52	46	42	39	42	47

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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