Readings on 21 Sep 2015

View reading for:

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	4(3)	54(53)	29(-)	36(15)	0.8(8)	38(80)
South	9(5)	45(45)	19(-)	46(20)	0.7(7)	37(79)
East	18(11)	45(45)	18(-)	60(25)	0.5(5)	37(79)
West	15(9)	57(54)	18(-)	50(21)	0.6(6)	42(85)
Central	8(5)	44(44)	22(-)	65(28)	0.7(7)	32(74)

1-hr PM_2.5 (µg/m³)^b Readings on 20 Sep 2015

View reading for:

Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
North	49	51	41	33	33	33	40	42	52	37	32	36
South	40	34	30	32	30	35	30	37	36	31	34	48
East	36	27	29	34	31	40	38	26	35	48	40	40
West	45	47	43	38	48	45	46	48	48	55	49	37
Central	31	29	26	29	22	25	26	33	37	30	38	33
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
North	35	43	46	43	37	39	22	22	26	40	52	19
South	41	34	39	36	29	35	35	40	38	45	47	40
East	37	39	34	37	32	37	39	42	45	44	39	36
West	50	49	53	53	36	31	27	26	29	29	35	48
Central	40	33	35	38	31	33	30	31	34	40	33	35

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 20 Sep 2015

Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
3-hr PSI	84	81	79	77	75	76	77	78	81	82	83	82
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
3-hr PSI	82	82	83	83	81	79	75	74	74	77	81	81

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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