Readings on 26 Jul 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)	31(31)	30(-)	28(12)	0.5(5)	17(56)
South	17(11)	23(23)	22(-)	26(11)	0.4(4)	16(55)
East	12(7)	19(19)	10(-)	38(16)	0.7(7)	12(49)
West	44(28)	40(40)	21(-)	24(10)	0.4(4)	24(64)
Central	10(6)	23(23)	16(-)	36(15)	0.4(4)	12(48)

1-hr PM_2.5 (µg/m³)^b Readings on 25 Jul 2015

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Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
North	21	25	20	20	20	20	27	23	15	12	17	16
South	25	20	13	12	20	16	10	10	10	6	12	8
East	17	12	8	10	7	10	8	8	10	9	14	8
West	35	32	23	28	25	25	36	33	31	37	30	18
Central	17	9	8	7	7	9	11	23	22	3	7	9
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
North	10	19	23	20	19	13	17	12	10	11	8	5
South	9	20	15	17	8	21	25	20	28	33	14	12
East	9	14	15	10	18	14	17	14	12	13	13	13
West	33	28	15	25	20	18	12	16	9	15	11	16
Central	11	10	16	15	12	15	24	9	14	7	9	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 25 Jul 2015

Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
3-hr PSI	61	61	59	56	54	55	56	58	58	56	55	53
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
3-hr PSI	53	54	56	57	56	56	56	56	55	54	53	51

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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