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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 09 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 6(4) 22(22) 35(-) 32(13) 0.2(2) 11(45)
South 4(3) 25(25) 37(-) 30(13) 0.4(4) 12(51)
East 8(5) 21(21) 17(-) 37(16) 0.4(4) 13(52)
West 3(2) 24(24) 20(-) 45(19) 0.4(4) 12(49)
Central 10(6) 22(22) 47(-) 41(17) 0.5(5) 10(43)

1-hr PM2.5 (µg/m3)b Readings on 09 Dec 2014

View reading for:

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

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 09 Dec 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 46 48 46 43 40 42 42 43 46 50 52 54
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 54 54 53 52 48 51 51 49 39 39 37 -

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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