Readings on 30 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)	33(-)	29(12)	0.5(5)	14(53)
South	14(9)	27(27)	7(-)	23(10)	0.5(5)	16(55)
East	10(6)	22(22)	14(-)	31(13)	0.8(8)	15(54)
West	62(39)	31(31)	5(-)	27(11)	0.5(5)	19(58)
Central	6(4)	26(26)	29(-)	29(12)	0.6(6)	13(52)

1-hr PM_2.5 (µg/m³)^b Readings on 29 Jun 2015

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

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 29 Jun 2015

Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
3-hr PSI	50	47	46	46	48	51	52	53	53	55	56	58
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
3-hr PSI	59	60	59	58	57	57	57	57	55	54	53	54

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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