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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 9(6) 33(33) 36(-) 94(40) 0.5(5) 19(59)
South 61(38) 39(39) 40(-) 79(33) 0.4(4) 25(66)
East 32(20) 33(33) 25(-) 96(40) 0.3(3) 24(65)
West 27(17) 40(40) 51(-) 90(38) 0.5(5) 25(66)
Central 45(28) 34(34) 47(-) 111(47) 0.4(4) 24(64)

1-hr PM2.5 (µg/m3)b Readings on 05 Dec 2014

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 23 18 22 25 11 17 12 7 16 20 24 22
South 22 21 22 14 21 15 15 18 27 12 16 29
East 29 29 29 18 17 17 16 13 13 12 17 25
West 20 13 20 15 22 14 20 22 21 20 15 12
Central 12 21 14 14 20 17 14 24 23 19 7 10
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 18 19 27 30 34 21 15 22 13 9 4 -
South 39 47 35 30 50 45 41 22 10 18 7 -
East 25 35 33 31 42 46 28 29 20 16 14 -
West 15 17 29 37 47 44 47 43 44 27 17 -
Central 29 54 37 33 41 49 40 33 21 13 11 -

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 05 Dec 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 62 62 61 60 59 57 56 55 57 58 57 57
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 60 67 72 74 78 81 82 77 70 63 56 -

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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