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Pollutant Concentrations

Readings on 31 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 7(4) 17(17) 34(-) 21(9) 0.2(2) 8(34)
South 25(16) 22(22) 34(-) 24(10) 0.3(3) 10(40)
East 7(4) 17(17) 10(-) 38(16) 0.6(6) 10(43)
West 4(2) 22(22) 17(-) 24(10) 0.3(3) 10(42)
Central 22(14) 19(19) 45(-) 35(15) 0.3(3) 9(36)

1-hr PM2.5 (µg/m3)b Readings on 30 Jan 2015

View reading for:

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

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 30 Jan 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 22 21 23 23 23 24 23 25 32 42 52 53
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 53 52 50 51 51 47 46 39 38 35 38 40



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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