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Pollutant Concentrations

Readings on 01 Feb 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 6(4) 21(21) 30(-) 20(8) 0.3(3) 10(43)
South 27(17) 23(23) 25(-) 22(10) 0.3(3) 8(33)
East 6(4) 20(20) 15(-) 40(17) 0.7(7) 12(51)
West 4(2) 24(24) 12(-) 28(12) 0.3(3) 11(45)
Central 14(9) 21(21) 31(-) 36(15) 0.3(3) 8(33)

1-hr PM2.5 (µg/m3)b Readings on 31 Jan 2015

View reading for:

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

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 31 Jan 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 39 39 36 33 33 33 34 33 34 40 48 52
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 51 48 51 51 51 43 46 46 45 37 32 32



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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