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Pollutant Concentrations

Readings on 16 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) 27(27) 26(-) 47(20) 0.6(6) 15(55)
South 9(6) 45(45) 6(-) 40(17) 0.4(4) 27(68)
East 8(5) 29(29) 7(-) 58(25) 0.6(6) 23(63)
West 9(5) 37(37) 10(-) 40(17) 0.5(5) 20(60)
Central 10(6) 31(31) 23(-) 66(28) 0.3(3) 17(56)

1-hr PM2.5 (µg/m3)b Readings on 15 Feb 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 13 16 13 17 15 14 15 13 13 16 20 7
South 48 30 41 84 77 46 9 23 23 11 21 23
East 21 16 15 12 12 13 48 41 22 21 47 41
West 18 19 16 9 6 10 14 18 23 25 24 17
Central 13 12 15 10 9 9 21 22 17 13 14 19
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 15 20 23 15 16 23 20 17 11 15 11 8
South 17 25 28 40 28 20 17 13 13 6 2 7
East 30 26 25 18 20 18 23 22 15 12 13 13
West 21 26 29 36 35 30 25 28 11 16 18 13
Central 26 23 25 31 26 22 20 17 18 8 8 7

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 15 Feb 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 58 58 61 62 64 63 61 61 62 60 61 61
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 63 62 64 67 67 66 63 61 57 54 49 44



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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