Readings on 16 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(4)	28(28)	22(-)	17(7)	0.7(7)	19(58)
South	13(8)	27(27)	19(-)	21(9)	0.5(5)	15(55)
East	12(7)	24(24)	19(-)	12(5)	1.6(16)	13(52)
West	19(12)	33(33)	27(-)	17(7)	0.4(4)	18(58)
Central	8(5)	25(25)	21(-)	25(11)	1.6(16)	13(52)

1-hr PM_2.5 (µg/m³)^b Readings on 15 Aug 2015

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Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
North	17	13	12	16	14	19	11	11	10	13	24	20
South	17	19	6	15	10	10	7	6	6	6	19	11
East	11	7	13	12	14	13	11	9	10	15	17	17
West	20	13	14	8	13	10	13	15	21	20	18	19
Central	8	10	11	6	12	7	13	13	14	6	6	14
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
North	12	25	27	45	39	31	18	18	14	15	13	11
South	14	16	14	19	27	11	19	31	22	22	22	16
East	16	14	12	14	15	17	10	17	17	8	7	13
West	19	28	28	22	30	27	12	15	17	17	15	18
Central	9	14	13	22	19	16	12	25	13	21	14	11

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 15 Aug 2015

Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
3-hr PSI	53	52	52	49	49	50	49	46	47	48	53	54
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
3-hr PSI	55	56	57	61	63	64	60	58	57	58	52	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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