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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 03 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) 31(31) 38(-) 40(17) 0.4(4) 17(56)
South 36(22) 32(32) 74(-) 35(15) 0.3(3) 20(60)
East 17(11) 28(28) 42(-) 65(28) 0.3(3) 20(60)
West 6(4) 28(28) 70(-) 36(15) 0.4(4) 14(54)
Central 14(9) 28(28) 76(-) 61(26) 0.5(5) 16(56)

1-hr PM2.5 (µg/m3)b Readings on 03 Dec 2014

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 21 21 18 19 18 23 21 11 13 19 19 24
South 15 16 17 26 25 23 20 23 14 29 24 29
East 16 23 22 24 23 24 22 22 26 26 24 12
West 8 12 17 21 21 14 9 11 11 11 18 19
Central 14 17 21 23 24 25 23 21 24 14 14 13
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 21 15 14 11 9 7 8 9 17 22 21 -
South 34 26 29 33 13 14 10 11 14 11 17 -
East 19 32 22 23 9 12 11 16 19 17 18 -
West 19 11 11 15 6 5 8 18 25 14 24 -
Central 14 15 12 10 6 9 14 8 19 16 19 -

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 03 Dec 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 52 55 57 60 61 62 61 59 58 58 59 59
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 60 60 59 58 54 50 39 45 53 55 58 -

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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