Readings on 24 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	5(3)	26(26)	34(-)	20(8)	0.5(5)	14(53)
South	13(8)	19(19)	21(-)	13(6)	0.4(4)	13(52)
East	6(3)	20(20)	15(-)	21(9)	0.6(6)	12(51)
West	25(15)	34(34)	38(-)	9(4)	0.6(6)	18(58)
Central	5(3)	22(22)	24(-)	17(7)	0.5(5)	10(43)

1-hr PM_2.5 (µg/m³)^b Readings on 23 Jul 2015

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Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
North	10	8	10	9	4	6	7	15	8	18	19	20
South	7	15	13	9	7	9	11	10	14	10	13	15
East	9	14	8	9	10	5	10	13	17	17	22	13
West	15	10	10	9	6	9	9	17	14	16	20	15
Central	10	10	7	6	5	3	3	11	9	12	18	10
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
North	16	18	24	21	10	13	13	12	18	16	19	20
South	15	10	20	20	8	18	12	18	18	21	12	17
East	14	11	19	11	11	14	16	17	6	11	12	9
West	21	18	21	24	26	20	21	26	26	27	31	26
Central	11	13	16	15	11	20	10	10	9	11	10	8

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 23 Jul 2015

Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
3-hr PSI	50	48	43	41	34	30	29	38	46	52	54	55
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
3-hr PSI	56	54	56	57	57	56	54	55	55	56	56	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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