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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 11 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(-) 30(13) 0.3(3) 14(53)
South 5(3) 30(30) 26(-) 24(10) 0.4(4) 15(54)
East 5(3) 26(26) 13(-) 38(16) 0.4(4) 15(55)
West 3(2) 27(27) 34(-) 33(14) 0.5(5) 13(52)
Central 9(6) 27(27) 61(-) 35(15) 0.5(5) 12(49)

1-hr PM2.5 (µg/m3)b Readings on 10 Dec 2014

View reading for:

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

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 43 45 42 41 44 47 51 52 53 54 55 55
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 55 55 55 56 55 54 53 54 54 53 54 53

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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