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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 29 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(5) 11(11) 3(-) 13(5) 0.3(3) 6(24)
South 6(4) 11(11) 19(-) 24(10) 0.3(3) 5(22)
East 4(2) 10(10) 16(-) 25(11) 0.5(5) 5(23)
West 3(2) 10(10) 6(-) 18(7) 0.4(4) 5(20)
Central 6(4) 11(11) 20(-) 32(14) 0.3(3) 5(22)

1-hr PM2.5 (µg/m3)b Readings on 29 Dec 2014

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 2 3 3 4 8 4 7 7 8 7 11 5
South 1 2 1 1 2 3 5 6 5 4 3 14
East 5 3 1 4 3 3 6 10 8 1 4 12
West 1 2 2 4 1 5 6 4 4 5 4 13
Central 2 4 3 5 4 7 4 4 6 4 5 9
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 4 6 6 4 10 5 5 7 7 6 5 -
South 11 12 13 6 9 4 2 5 4 7 3 -
East 8 13 7 3 5 7 4 4 5 4 7 -
West 8 7 11 3 5 6 1 4 2 7 5 -
Central 7 5 7 5 10 7 6 6 5 7 5 -

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 29 Dec 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 12 10 10 12 13 17 19 23 25 24 23 29
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 33 38 35 30 29 25 24 21 19 22 22 -

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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