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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 26 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(4) 24(24) 36(-) 25(11) 0.5(5) 13(53)
South 15(9) 20(20) 8(-) 28(12) 0.4(4) 13(52)
East 5(3) 19(19) 18(-) 37(16) 0.5(5) 13(52)
West 18(11) 25(25) 24(-) 28(12) 0.4(4) 15(54)
Central 14(8) 17(17) 34(-) 54(23) 0.4(4) 11(47)

1-hr PM2.5 (µg/m3)b Readings on 25 Dec 2014

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 19 12 6 6 5 6 6 7 8 13 18 20
South 8 6 7 6 9 6 6 9 13 10 19 10
East 13 12 9 18 21 12 10 14 16 13 10 10
West 12 13 12 12 10 7 9 7 5 11 18 22
Central 10 7 8 6 6 8 4 7 13 13 9 5
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 15 20 15 11 8 7 19 22 27 25 19 10
South 21 30 20 22 16 7 5 15 19 9 23 17
East 10 11 5 7 8 7 9 12 21 23 22 22
West 14 27 30 26 13 17 13 14 12 14 23 18
Central 12 15 7 3 6 8 10 22 28 24 23 14

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 25 Dec 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 45 47 42 39 39 38 35 33 38 44 51 52
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 53 55 56 56 52 46 42 51 56 59 61 59

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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