Readings on 25 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	6(4)	24(24)	40(-)	14(6)	0.5(5)	11(47)
South	12(8)	19(19)	74(-)	13(6)	0.6(6)	13(52)
East	6(4)	20(20)	37(-)	14(6)	0.9(9)	12(49)
West	18(12)	28(28)	43(-)	21(9)	0.4(4)	15(54)
Central	8(5)	24(24)	58(-)	15(6)	0.6(6)	11(46)

1-hr PM_2.5 (µg/m³)^b Readings on 24 Jul 2015

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

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 24 Jul 2015

Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
3-hr PSI	54	49	43	44	45	41	38	39	43	46	48	47
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
3-hr PSI	47	51	54	55	54	52	52	51	49	51	54	58

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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