Readings on 15 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	8(5)	33(33)	25(-)	16(7)	0.6(6)	19(58)
South	18(11)	29(29)	21(-)	20(8)	0.4(4)	16(56)
East	12(7)	23(23)	13(-)	18(8)	0.5(5)	14(53)
West	28(17)	37(37)	36(-)	16(7)	0.4(4)	22(62)
Central	9(5)	25(25)	28(-)	20(9)	0.5(5)	14(53)

1-hr PM_2.5 (µg/m³)^b Readings on 14 Aug 2015

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

Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
3-hr PSI	52	54	54	54	53	54	55	56	56	58	58	60
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
3-hr PSI	60	59	58	59	61	60	60	58	57	54	53	52

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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