Readings on 19 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	5(3)	34(34)	38(-)	31(13)	0.3(3)	17(57)
South	11(7)	35(35)	22(-)	30(13)	0.4(4)	18(58)
East	10(6)	29(29)	9(-)	40(17)	0.6(6)	19(59)
West	38(24)	40(40)	28(-)	30(13)	0.5(5)	22(62)
Central	7(4)	32(32)	23(-)	44(19)	0.2(2)	16(55)

1-hr PM_2.5 (µg/m³)^b Readings on 18 Aug 2015

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Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
North	12	17	10	12	9	10	11	9	11	21	17	20
South	11	19	7	17	8	11	18	13	10	18	13	19
East	13	14	13	14	11	13	17	11	13	17	22	19
West	8	16	21	8	8	14	8	18	17	22	26	28
Central	9	9	6	8	5	10	11	11	11	17	15	17
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
North	31	33	34	39	37	29	16	15	10	5	5	7
South	19	28	31	32	24	24	22	28	15	16	22	15
East	24	26	29	35	25	25	27	28	20	16	13	14
West	30	38	39	38	43	28	26	9	20	22	19	18
Central	18	27	31	33	29	16	19	21	11	11	17	15

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 18 Aug 2015

Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
3-hr PSI	48	51	51	52	43	44	46	51	52	54	56	59
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
3-hr PSI	61	66	70	74	75	72	67	62	59	56	54	54

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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