Readings on 17 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	11(7)	27(27)	41(-)	17(7)	0.5(5)	14(53)
South	11(7)	27(27)	33(-)	19(8)	0.4(4)	15(54)
East	14(9)	19(19)	32(-)	17(7)	1.1(11)	12(51)
West	35(22)	28(28)	30(-)	20(9)	0.3(3)	16(55)
Central	10(6)	22(22)	42(-)	20(8)	0.9(9)	11(45)

1-hr PM_2.5 (µg/m³)^b Readings on 16 Jul 2015

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

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 16 Jul 2015

Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
3-hr PSI	55	54	53	47	38	37	39	51	52	55	56	57
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
3-hr PSI	56	56	54	54	53	53	51	47	45	52	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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