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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 08 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 6(4) 20(20) 35(-) 24(10) 0.3(3) 11(46)
South 13(8) 21(21) 48(-) 12(5) 0.4(4) 12(51)
East 8(5) 18(18) 19(-) 30(13) 0.4(4) 12(49)
West 3(2) 18(18) 40(-) 25(10) 0.5(5) 8(35)
Central 8(5) 17(17) 54(-) 29(12) 0.6(6) 9(37)

1-hr PM2.5 (µg/m3)b Readings on 08 Dec 2014

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 10 6 6 12 9 11 11 10 9 13 15 15
South 9 15 9 11 5 12 8 12 8 15 21 24
East 11 12 13 16 13 7 10 14 11 12 15 13
West 5 6 7 9 7 7 3 7 6 6 8 9
Central 12 9 9 6 7 9 8 9 7 6 10 11
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 14 12 14 9 16 7 20 8 10 7 7 -
South 22 24 22 13 23 4 8 15 3 4 3 -
East 14 11 15 8 12 5 11 10 10 11 13 -
West 13 6 12 9 12 8 6 7 8 12 21 -
Central 12 10 11 7 11 5 11 14 6 7 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 08 Dec 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 33 37 38 40 39 40 36 39 37 40 45 52
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 54 53 53 51 52 42 45 39 41 37 36 -

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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