Readings on 22 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)	23(23)	33(-)	25(10)	0.4(4)	11(47)
South	10(6)	22(22)	7(-)	21(9)	0.4(4)	9(40)
East	14(9)	19(19)	13(-)	23(10)	0.7(7)	12(49)
West	68(43)	27(27)	36(-)	22(9)	0.3(3)	15(54)
Central	7(4)	21(21)	35(-)	21(9)	0.4(4)	9(37)

1-hr PM_2.5 (µg/m³)^b Readings on 21 Jun 2015

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

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 21 Jun 2015

Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
3-hr PSI	47	44	39	32	32	34	40	43	42	37	35	40
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
3-hr PSI	46	46	46	49	53	55	55	54	53	52	52	52

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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