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Pollutant Concentrations

Readings on 18 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) 30(30) 41(-) 38(16) 0.4(4) 13(53)
South 12(8) 28(28) 13(-) 27(12) 0.4(4) 15(55)
East 7(5) 22(22) 6(-) 39(16) 0.6(6) 15(54)
West 4(3) 29(29) 9(-) 44(18) 0.5(5) 16(55)
Central 9(6) 29(29) 24(-) 47(20) 0.3(3) 15(54)

1-hr PM2.5 (µg/m3)b Readings on 17 Feb 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 10 4 8 12 16 13 13 14 16 14 15 14
South 15 5 11 11 14 17 10 9 16 19 25 31
East 14 13 15 12 15 19 17 12 15 24 28 20
West 10 13 9 10 15 11 15 18 13 19 27 26
Central 22 14 9 12 14 22 16 13 15 19 16 23
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 13 17 21 21 17 17 9 17 12 9 13 9
South 26 19 27 23 23 22 13 10 2 8 3 6
East 16 16 16 19 11 11 10 13 7 6 12 15
West 24 15 14 23 21 13 16 10 14 12 12 13
Central 12 13 12 12 13 17 16 16 13 16 14 11

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 17 Feb 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 51 50 48 44 51 53 54 54 53 55 58 61
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 61 59 57 58 58 57 55 53 49 46 42 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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