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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 24 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 2(1) 21(21) 41(-) 12(5) 0.3(3) 11(48)
South 16(10) 25(25) 35(-) 13(5) 0.6(6) 15(55)
East 6(4) 20(20) 9(-) 15(6) 0.4(4) 14(54)
West 7(4) 23(23) 20(-) 16(7) 0.5(5) 12(51)
Central 9(6) 20(20) 37(-) 21(9) 0.6(6) 11(47)

1-hr PM2.5 (µg/m3)b Readings on 24 Nov 2014

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 9 17 18 13 8 6 6 11 19 15 16 12
South 30 11 13 11 6 6 4 7 15 33 37 28
East 19 16 14 24 21 26 6 12 11 19 14 15
West 6 11 5 6 16 9 8 12 23 21 19 15
Central 13 13 10 16 4 10 6 10 6 12 11 14
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 19 19 12 12 11 8 8 6 9 3 7 -
South 22 25 12 13 18 6 1 3 13 17 8 -
East 16 18 18 20 10 11 9 13 10 7 5 -
West 9 11 18 9 5 19 4 13 16 19 8 -
Central 12 16 18 20 19 8 4 14 13 6 3 -

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 24 Nov 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 54 55 53 52 51 51 39 38 43 54 58 59
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 57 56 56 55 53 52 39 35 37 44 40 -

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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