Readings on 24 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)	29(29)	43(-)	32(14)	0.5(5)	17(56)
South	7(5)	31(31)	6(-)	27(11)	0.4(4)	17(57)
East	11(7)	26(26)	12(-)	37(16)	0.7(7)	17(57)
West	46(29)	35(35)	27(-)	30(13)	0.3(3)	21(61)
Central	4(3)	29(29)	34(-)	35(15)	0.5(5)	16(56)

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

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

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 Jun 2015

Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
3-hr PSI	56	55	52	52	52	53	54	56	57	59	60	62
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
3-hr PSI	62	63	62	61	61	60	59	57	56	56	57	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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