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Pollutant Concentrations

Air quality readings will be available hourly from 7am to 11pm. Air quality readings from 12am to 6am will be made available at 7am on the same day.

 

Readings on 26 Dec 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 7(4) 20(20) 42(-) 4(2) 0.5(5) 10(41)
South 10(6) 18(18) 9(-) 7(3) 0.5(5) 10(41)
East 5(3) 20(20) 29(-) 6(2) 0.6(6) 14(53)
West 2(1) 15(15) 29(-) 8(3) 0.4(4) 9(36)
Central 12(7) 18(18) 47(-) 19(8) 0.5(5) 11(46)

1-hr PM2.5 (µg/m3)b Readings on 26 Dec 2014

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 8 13 17 11 7 12 12 12 17 14 7 8
South 15 13 12 9 12 7 4 10 11 11 11 12
East 15 20 18 16 20 19 11 15 10 10 13 15
West 12 13 11 13 8 7 9 5 8 9 7 11
Central 15 13 18 11 15 7 8 11 11 11 14 14
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 8 10 14 7 7 8 9 7 3 7 6 -
South 16 14 11 5 6 6 7 3 7 13 6 -
East 12 12 12 6 8 6 6 11 15 19 18 -
West 11 9 7 5 7 5 3 3 8 7 10 -
Central 15 17 12 9 8 8 7 6 11 10 2 -

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 26 Dec 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 57 54 53 53 52 48 44 41 43 46 45 46
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 49 51 51 42 35 28 28 26 29 36 40 -

Hourly updates of 3-hr PSI readings are provided from 7am to 11pm. The 3-hr PSI readings from 12am to 6am will be made available at 7am on the same day. The 3-hr PSI readings are calculated based on PM2.5 concentrations only.

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