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Pollutant Concentrations

Readings on 24 Jan 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 PM2.5
(µg/m3)
North 10(6) 26(26) 29(-) 37(16) 0.4(4) 14(53)
South 17(10) 31(31) 20(-) 45(19) 0.3(3) 14(53)
East 6(4) 26(26) 9(-) 55(23) 0.5(5) 17(56)
West 3(2) 31(31) 24(-) 55(23) 0.4(4) 16(55)
Central 10(6) 30(30) 22(-) 53(22) 0.3(3) 14(53)

1-hr PM2.5 (µg/m3)b Readings on 23 Jan 2015

View reading for:

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

Note:
a Sub-index for nitrogen dioxide is reported only when the 1-hr concentration equals or exceeds 1130 µg/m3.

b There is no sub-index for 1-hr PM2.5.

3-hr PSI Readings from 1am to 12am on 23 Jan 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 69 69 66 63 59 56 54 53 51 50 52 54
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 55 53 52 47 49 46 52 52 52 48 51 51



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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