Readings on 25 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)	31(31)	36(-)	40(17)	0.5(5)	18(57)
South	9(5)	32(32)	6(-)	31(13)	0.5(5)	17(56)
East	11(7)	27(27)	9(-)	47(20)	0.7(7)	18(58)
West	41(25)	36(36)	38(-)	37(16)	0.4(4)	21(62)
Central	7(4)	31(31)	32(-)	40(17)	0.5(5)	16(55)

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

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Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
North	14	9	11	14	12	18	13	17	12	18	20	18
South	17	15	13	12	11	15	9	10	17	14	23	9
East	12	12	17	10	15	14	16	9	14	18	22	20
West	22	16	15	15	18	15	18	20	15	22	27	28
Central	11	8	13	13	16	13	11	10	13	11	17	20
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
North	21	23	21	19	22	24	20	17	16	20	25	22
South	21	17	12	21	21	17	23	21	16	28	28	13
East	21	21	21	19	21	23	26	31	24	20	20	15
West	24	20	17	20	26	19	26	26	24	22	27	33
Central	20	22	23	21	19	20	21	17	17	14	18	10

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 Jun 2015

Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
3-hr PSI	55	53	53	52	53	53	54	53	53	54	57	59
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
3-hr PSI	61	60	60	60	60	61	62	62	62	61	61	61

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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