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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 14 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) 21(21) 33(-) 32(13) 0.2(2) 12(51)
South 5(3) 23(23) 12(-) 18(7) 0.4(4) 14(53)
East 6(4) 19(19) 11(-) 39(17) 0.2(2) 12(51)
West 7(4) 23(23) 12(-) 25(11) 0.4(4) 14(53)
Central 12(7) 22(22) 43(-) 33(14) 0.2(2) 11(48)

1-hr PM2.5 (µg/m3)b Readings on 14 Dec 2014

View reading for:

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

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 14 Dec 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 53 55 57 58 59 59 57 55 53 52 52 49
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 49 45 45 41 42 41 39 37 36 35 34 -

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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