Readings on 22 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(4)	26(26)	33(-)	19(8)	0.5(5)	14(53)
South	9(6)	21(21)	17(-)	17(7)	0.4(4)	13(53)
East	8(5)	18(18)	17(-)	21(9)	0.4(4)	12(48)
West	38(23)	29(29)	41(-)	16(7)	0.4(4)	16(55)
Central	6(4)	21(21)	41(-)	15(7)	0.4(4)	10(41)

1-hr PM_2.5 (µg/m³)^b Readings on 21 Jul 2015

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Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
North	10	11	5	8	7	6	5	7	13	13	17	17
South	3	7	4	7	11	5	5	11	17	15	19	20
East	8	7	8	11	7	10	7	12	13	13	16	15
West	17	7	11	7	9	7	14	13	19	10	22	24
Central	8	7	7	6	8	4	5	10	16	9	14	14
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
North	21	24	21	21	17	19	15	14	8	13	9	30
South	17	18	18	22	17	26	14	19	14	16	7	10
East	14	18	14	13	16	12	13	15	8	7	11	11
West	21	18	16	12	19	18	20	15	13	13	16	37
Central	11	22	12	10	15	14	9	13	7	6	7	7

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 21 Jul 2015

Time	1am	2am	3am	4am	5am	6am	7am	8am	9am	10am	11am	12pm
3-hr PSI	38	36	34	31	33	32	31	34	46	52	54	55
Time	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm	10pm	11pm	12am
3-hr PSI	57	58	57	57	55	56	56	55	52	50	43	52

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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