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Pollutant Concentrations

Readings on 26 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 4(3) 21(21) 36(-) 38(16) 0.4(4) 11(47)
South 9(6) 26(26) 23(-) 30(13) 0.3(3) 12(51)
East 11(7) 22(22) 12(-) 42(18) 0.4(4) 16(55)
West 14(9) 27(27) 21(-) 39(17) 0.4(4) 16(55)
Central 8(5) 24(24) 25(-) 46(20) 0.3(3) 13(52)

1-hr PM2.5 (µg/m3)b Readings on 25 Feb 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 11 6 9 9 7 6 10 7 11 11 16 9
South 6 5 5 4 5 6 8 11 12 16 15 26
East 7 8 12 10 15 27 22 22 15 16 15 18
West 11 8 8 9 15 6 16 13 13 20 24 20
Central 6 5 7 6 4 14 7 13 14 8 9 22
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 11 17 16 15 15 13 13 13 11 10 17 10
South 28 26 22 17 22 6 3 3 4 10 14 14
East 20 19 21 17 14 23 13 9 13 11 13 14
West 14 19 25 24 27 17 14 21 14 15 11 17
Central 23 18 26 24 12 15 15 15 13 12 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 25 Feb 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 36 32 31 31 34 40 47 52 52 53 54 56
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 58 59 60 60 60 57 54 52 48 48 51 52



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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