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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 05 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) 28(28) 35(-) 4(2) 0.6(6) 18(57)
South 46(29) 25(25) 56(-) 4(2) 0.5(5) 15(54)
East 15(10) 19(19) 35(-) 9(4) 0.5(5) 13(52)
West 11(7) 29(29) 34(-) 11(5) 0.5(5) 15(54)
Central 36(22) 24(24) 56(-) 13(5) 0.5(5) 15(55)

1-hr PM2.5 (µg/m3)b Readings on 04 Dec 2014

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 30 33 26 21 17 22 23 26 16 9 6 8
South 19 17 12 13 16 16 16 16 19 10 10 10
East 13 13 15 18 16 12 19 16 11 9 8 9
West 23 21 26 26 31 22 17 17 11 7 7 11
Central 14 11 14 19 20 25 18 23 14 5 10 14
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 10 9 9 10 12 16 14 16 22 25 21 23
South 9 6 12 12 13 10 22 18 12 21 21 32
East 9 6 11 10 8 5 10 9 15 24 23 32
West 8 7 7 10 8 12 12 13 16 14 11 19
Central 13 10 8 11 17 14 18 20 16 14 21 16

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 04 Dec 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 60 59 59 59 59 60 59 59 57 53 42 36
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 39 38 37 38 44 47 52 53 55 57 58 61

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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