Readings on 01 Jul 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	6(3)	31(31)	36(-)	36(15)	0.5(5)	21(61)
South	16(10)	30(30)	6(-)	31(13)	0.5(5)	18(58)
East	7(4)	24(24)	10(-)	36(15)	0.7(7)	17(57)
West	44(27)	37(37)	7(-)	30(13)	0.5(5)	22(62)
Central	8(5)	29(29)	30(-)	33(14)	0.7(7)	17(56)

1-hr PM_2.5 (µg/m³)^b Readings on 30 Jun 2015

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Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
North	13	7	13	10	12	13	14	18	16	16	24	21
South	15	10	11	15	8	10	8	6	10	18	21	19
East	13	14	10	13	13	12	10	10	15	16	18	21
West	10	12	13	14	12	11	10	11	18	20	25	27
Central	7	8	11	13	10	11	9	13	12	11	13	20
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
North	23	28	35	35	37	35	34	30	21	19	19	12
South	20	23	30	28	29	32	31	12	23	23	16	21
East	21	21	24	24	25	22	28	21	17	17	13	12
West	34	34	34	33	26	38	25	26	27	21	20	19
Central	21	25	30	38	25	28	30	28	17	8	10	8

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 30 Jun 2015

Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
3-hr PSI	52	48	46	48	49	49	45	46	51	53	56	59
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
3-hr PSI	62	64	68	71	71	71	71	69	65	61	58	55

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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