Readings on 21 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	9(6)	52(51)	47(-)	42(18)	0.5(5)	38(80)
South	13(8)	43(43)	33(-)	33(14)	0.6(6)	29(71)
East	17(11)	37(37)	9(-)	40(17)	0.4(4)	27(68)
West	36(23)	51(51)	33(-)	38(16)	0.5(5)	34(76)
Central	11(7)	43(43)	32(-)	47(20)	0.4(4)	28(68)

1-hr PM_2.5 (µg/m³)^b Readings on 20 Aug 2015

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Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
North	18	18	14	12	9	18	10	16	19	27	26	45
South	21	23	17	10	6	12	15	26	25	13	13	32
East	18	18	21	17	16	15	19	11	19	16	28	26
West	22	16	21	16	18	9	20	22	22	25	31	39
Central	15	19	12	12	15	9	14	15	17	12	17	25
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
North	51	69	85	81	67	61	53	47	41	40	39	36
South	28	40	42	47	50	52	42	41	40	41	42	28
East	30	33	41	32	48	41	36	37	39	44	26	23
West	39	56	65	66	65	59	41	35	39	32	35	29
Central	31	42	61	53	63	42	36	34	28	33	29	29

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 20 Aug 2015

Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
3-hr PSI	63	60	58	56	54	52	53	55	58	59	61	66
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
3-hr PSI	72	81	91	99	103	100	94	87	82	80	79	76

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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