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Pollutant Concentrations

Air quality readings will be available hourly from 1am to 12am.

Readings on 10 Oct 2014

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 30(18) 39(39) 41(-) 34(15) 0.6(6) 22(63)
South 12(8) 37(37) 31(-) 30(13) 0.5(5) 22(63)
East 10(6) 30(30) 13(-) 44(19) 0.2(2) 22(63)
West 28(18) 45(45) 32(-) 29(12) 0.5(5) 29(70)
Central 22(14) 35(35) 37(-) 47(20) 0.4(4) 20(60)

1-hr PM2.5 (µg/m3)b Readings on 09 Oct 2014

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 11 16 14 15 10 17 18 17 23 22 20 19
South 21 8 10 12 16 20 21 23 22 25 18 35
East 21 17 13 18 16 23 18 24 18 20 15 14
West 37 26 20 14 13 16 26 27 29 28 31 35
Central 19 14 13 13 15 16 16 16 13 16 8 20
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 27 31 31 31 28 29 20 26 38 37 20 18
South 37 44 36 36 32 18 21 16 11 18 18 20
East 24 29 29 34 34 32 27 27 21 22 23 19
West 39 39 38 34 39 38 39 29 36 27 20 16
Central 27 27 28 32 38 28 25 25 15 17 16 16

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 09 Oct 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 72 63 57 54 53 55 57 60 61 62 61 62
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 65 71 74 75 75 74 71 67 66 65 63 60

Hourly updates of 3-hr PSI readings are provided from 1am to 12am. The 3-hr PSI readings are calculated based on PM2.5 concentrations only.

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