Readings on 23 Jun 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)	24(24)	36(-)	33(14)	0.4(4)	14(53)
South	8(5)	25(25)	6(-)	30(13)	0.4(4)	14(53)
East	11(7)	20(20)	9(-)	39(16)	0.7(7)	13(52)
West	51(32)	27(27)	34(-)	31(13)	0.3(3)	16(56)
Central	5(3)	23(23)	27(-)	35(15)	0.5(5)	12(48)

1-hr PM_2.5 (µg/m³)^b Readings on 22 Jun 2015

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Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
North	11	8	15	8	9	7	9	12	10	9	17	13
South	16	12	10	9	5	8	5	7	8	19	17	16
East	10	8	8	8	7	11	5	7	10	14	16	18
West	18	11	17	10	7	11	13	14	11	14	14	17
Central	11	9	9	9	12	6	4	10	6	8	6	13
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
North	14	16	17	19	21	23	18	20	17	10	18	17
South	11	11	7	16	19	11	15	23	24	19	20	21
East	12	18	16	13	15	15	13	22	15	18	17	15
West	15	19	19	23	22	19	16	17	18	21	23	24
Central	18	20	14	17	16	21	14	11	11	8	11	12

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 22 Jun 2015

Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
3-hr PSI	52	49	47	42	40	36	33	36	36	44	50	53
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
3-hr PSI	54	55	54	56	56	58	57	57	56	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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