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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 12 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) 27(27) 36(-) 17(7) 0.4(4) 13(52)
South 5(3) 28(28) 9(-) 12(5) 0.5(5) 13(53)
East 6(4) 23(23) 16(-) 24(10) 0.3(3) 14(53)
West 4(2) 30(30) 54(-) 12(5) 0.5(5) 15(54)
Central 10(6) 25(25) 63(-) 17(7) 0.5(5) 11(46)

1-hr PM2.5 (µg/m3)b Readings on 11 Dec 2014

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 12 14 13 10 25 16 8 13 8 10 14 19
South 4 10 10 6 9 10 6 15 17 16 23 25
East 15 18 16 20 18 16 13 15 11 17 22 11
West 12 19 13 19 14 15 16 17 13 17 22 17
Central 9 11 7 9 9 8 9 19 13 9 9 15
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 19 21 19 13 10 8 10 13 13 8 9 13
South 21 23 22 12 21 12 8 8 8 15 10 11
East 11 13 18 15 20 7 14 8 10 11 10 13
West 26 13 21 12 7 5 7 7 10 15 17 26
Central 11 11 17 12 18 8 12 8 8 11 14 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 11 Dec 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 52 50 51 52 52 53 52 52 52 53 54 56
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 57 57 57 55 55 50 46 38 41 43 47 52

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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