Readings on 21 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	7(4)	22(22)	29(-)	27(11)	0.4(4)	12(51)
South	9(6)	23(23)	25(-)	23(10)	0.4(4)	11(45)
East	9(6)	18(18)	12(-)	23(10)	0.4(4)	11(44)
West	43(27)	28(28)	28(-)	26(11)	0.4(4)	15(54)
Central	7(5)	21(21)	37(-)	21(9)	0.4(4)	9(39)

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

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Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
North	12	12	12	11	13	10	11	13	13	11	10	12
South	6	5	7	9	6	5	9	14	11	14	14	16
East	9	11	9	7	10	11	12	10	6	10	13	13
West	11	8	10	11	8	12	12	17	17	16	17	19
Central	13	9	8	9	6	5	6	12	15	10	10	9
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
North	14	13	18	18	20	14	11	11	11	5	11	6
South	8	12	12	11	10	16	14	19	14	10	5	10
East	10	9	15	11	13	11	11	12	10	8	12	10
West	22	20	19	22	21	16	17	11	13	12	11	13
Central	9	10	16	13	12	14	18	6	3	3	6	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 20 Jul 2015

Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
3-hr PSI	46	41	39	38	38	37	38	44	50	52	51	52
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
3-hr PSI	52	52	53	54	55	54	54	52	50	41	37	35

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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