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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 01 Jan 2015

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 11(7) 28(28) 34(-) 26(11) 0.4(4) 15(55)
South 5(3) 30(30) 26(-) 40(17) 0.4(4) 17(56)
East 7(4) 26(26) 11(-) 49(21) 0.3(3) 19(59)
West 2(2) 31(31) 14(-) 28(12) 0.5(5) 18(57)
Central 6(4) 29(29) 28(-) 63(27) 0.4(4) 15(54)

1-hr PM2.5 (µg/m3)b Readings on 01 Jan 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 10 10 10 11 12 13 16 13 11 15 27 21
South 14 17 22 19 19 17 10 12 20 16 14 17
East 15 18 17 13 13 14 23 31 25 17 23 20
West 23 22 21 21 20 20 14 18 15 11 18 13
Central 13 20 20 18 15 20 9 8 14 14 14 12
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 22 16 18 18 13 18 16 17 13 14 14 -
South 26 25 23 19 19 13 14 13 15 13 11 -
East 29 16 23 19 17 15 16 17 18 20 20 -
West 20 18 25 13 19 13 14 17 18 15 20 -
Central 18 19 24 14 15 12 12 16 11 13 8 -

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 01 Jan 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 53 55 56 57 56 56 55 55 55 55 57 56
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 59 59 62 59 58 55 54 54 54 55 54 -

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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