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Pollutant Concentrations

Readings on 15 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 5(3) 31(31) 33(-) 48(20) 0.6(6) 16(56)
South 12(8) 39(39) 12(-) 42(18) 0.4(4) 20(60)
East 7(5) 37(37) 8(-) 58(25) 0.6(6) 28(69)
West 5(3) 39(39) 21(-) 56(24) 0.5(5) 20(60)
Central 10(6) 33(33) 38(-) 58(25) 0.4(4) 16(56)

1-hr PM2.5 (µg/m3)b Readings on 14 Feb 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 9 15 14 16 17 13 19 20 14 11 13 14
South 14 9 14 8 13 13 15 14 17 15 39 25
East 78 15 12 17 13 40 66 24 22 68 44 19
West 25 18 19 15 13 11 21 15 21 18 28 21
Central 11 12 13 11 14 14 10 16 13 16 13 18
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 14 16 22 17 18 19 18 21 18 19 15 16
South 44 32 25 32 36 20 18 18 13 19 25 6
East 26 22 22 20 24 25 21 21 16 16 18 17
West 19 27 30 21 32 28 20 17 13 13 22 14
Central 28 21 17 17 21 20 23 21 17 16 11 14

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 14 Feb 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 66 63 58 53 53 54 59 61 61 60 64 65
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 65 63 65 63 64 64 63 61 58 57 56 56



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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