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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 31 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 8(5) 25(25) 30(-) 24(10) 0.4(4) 12(51)
South 5(3) 22(22) 16(-) 31(13) 0.4(4) 11(48)
East 7(4) 22(22) 7(-) 52(22) 0.2(2) 13(52)
West 3(2) 24(24) 14(-) 29(12) 0.5(5) 13(52)
Central 6(4) 20(20) 41(-) 24(10) 0.4(4) 10(42)

1-hr PM2.5 (µg/m3)b Readings on 31 Dec 2014

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 10 7 13 13 15 12 11 8 10 13 18 19
South 8 11 9 9 12 6 5 5 11 9 18 20
East 19 20 15 13 12 13 13 15 12 13 13 13
West 16 17 14 15 16 11 11 14 8 9 13 17
Central 8 10 10 7 6 7 10 10 10 9 11 15
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 14 20 10 9 12 8 11 14 9 13 16 -
South 21 20 11 13 12 17 9 8 8 10 10 -
East 14 13 16 16 12 13 9 14 8 9 14 -
West 15 18 12 9 15 14 9 10 6 10 16 -
Central 10 11 15 13 8 11 12 9 7 8 10 -

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 31 Dec 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 49 52 51 51 50 46 44 42 42 43 49 53
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 55 55 54 53 51 50 48 47 40 40 43 -

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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