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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 30 Nov 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) 25(25) 41(-) 39(16) 0.4(4) 13(52)
South 39(24) 20(20) 54(-) 30(13) 0.3(3) 11(46)
East 22(14) 19(19) 10(-) 52(22) 0.5(5) 14(53)
West 13(8) 17(17) 15(-) 46(19) 0.3(3) 9(36)
Central 27(17) 20(20) 48(-) 48(20) 0.4(4) 11(48)

1-hr PM2.5 (µg/m3)b Readings on 30 Nov 2014

View reading for:

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

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 30 Nov 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 37 39 49 53 53 50 42 36 32 33 42 53
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 55 55 53 54 54 52 47 41 38 38 46 -

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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