Readings on 26 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)	28(28)	35(-)	34(14)	0.5(5)	17(57)
South	9(6)	30(30)	8(-)	31(13)	0.4(4)	19(58)
East	10(6)	26(26)	10(-)	43(18)	0.7(7)	18(57)
West	41(26)	35(35)	40(-)	32(13)	0.4(4)	21(61)
Central	5(3)	32(32)	37(-)	36(15)	0.5(5)	15(54)

1-hr PM_2.5 (µg/m³)^b Readings on 25 Jun 2015

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Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
North	11	10	15	15	18	17	19	18	17	18	16	18
South	13	14	9	19	14	14	14	20	14	24	29	21
East	9	18	20	16	13	15	17	23	17	23	21	21
West	25	22	23	20	17	17	23	19	22	26	29	26
Central	8	13	13	17	17	13	12	20	13	12	14	20
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
North	17	21	26	21	22	19	25	20	15	14	13	7
South	26	22	17	26	32	30	17	12	13	19	15	14
East	22	17	24	17	24	17	24	20	8	11	11	11
West	33	23	19	23	25	21	19	15	17	18	14	14
Central	29	24	28	22	15	20	19	11	8	4	5	2

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 25 Jun 2015

Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
3-hr PSI	58	55	54	56	56	56	55	57	57	59	60	61
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
3-hr PSI	63	63	63	62	63	62	62	59	56	53	51	48

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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