Readings on 29 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)	19(19)	32(-)	11(5)	0.4(4)	9(39)
South	12(7)	15(15)	26(-)	10(4)	0.4(4)	11(45)
East	9(6)	16(16)	19(-)	8(3)	0.4(4)	8(34)
West	15(9)	25(25)	28(-)	10(4)	0.4(4)	13(52)
Central	7(4)	16(16)	25(-)	10(4)	0.4(4)	8(32)

1-hr PM_2.5 (µg/m³)^b Readings on 28 Jul 2015

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Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
North	9	13	6	6	7	7	8	10	8	7	12	9
South	26	13	8	6	3	11	7	6	9	3	10	16
East	16	10	8	10	8	4	6	7	7	7	8	7
West	17	23	10	26	12	16	3	7	15	10	11	10
Central	17	11	6	4	2	5	3	7	8	7	8	7
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
North	18	15	10	11	16	17	7	6	6	5	7	6
South	20	4	11	21	10	18	5	19	7	8	14	4
East	8	10	7	13	8	10	9	14	5	6	7	4
West	14	12	12	15	19	10	14	10	14	14	5	7
Central	17	10	11	13	5	5	7	8	5	5	6	6

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 28 Jul 2015

Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
3-hr PSI	57	56	52	44	33	35	28	30	31	33	36	37
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
3-hr PSI	49	50	50	49	50	52	44	44	38	37	32	29

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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