Readings on 01 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	6(4)	39(39)	51(-)	8(3)	0.7(7)	23(63)
South	16(10)	24(24)	60(-)	6(3)	0.6(6)	17(56)
East	11(7)	21(21)	27(-)	8(3)	0.9(9)	14(54)
West	15(10)	38(38)	51(-)	9(4)	0.4(4)	21(61)
Central	8(5)	27(27)	51(-)	7(3)	0.7(7)	15(54)

1-hr PM_2.5 (µg/m³)^b Readings on 31 Jul 2015

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Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
North	24	37	33	28	35	31	17	14	22	23	21	16
South	12	19	10	13	11	19	11	13	14	12	10	12
East	12	10	11	15	14	10	17	17	12	10	15	14
West	16	20	27	22	30	24	18	29	30	30	17	22
Central	7	10	7	12	6	10	18	21	14	14	13	10
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
North	22	28	19	12	15	9	16	29	36	14	15	25
South	17	20	26	22	27	18	25	32	9	18	11	21
East	8	15	13	17	12	12	19	27	26	13	13	11
West	25	18	18	19	17	10	14	16	15	24	22	20
Central	17	15	13	18	15	22	24	26	21	7	13	16

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 31 Jul 2015

Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
3-hr PSI	55	55	57	58	58	59	58	58	57	58	57	55
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
3-hr PSI	55	57	58	58	57	56	57	60	63	61	57	56

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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