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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 16 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) 22(22) 33(-) 10(4) 0.4(4) 11(44)
South 4(2) 20(20) 7(-) 6(2) 0.7(7) 10(41)
East 10(6) 19(19) 14(-) 11(5) 0.5(5) 11(48)
West 4(3) 18(18) 24(-) 14(6) 0.4(4) 9(37)
Central 13(8) 15(15) 41(-) 20(9) 0.6(6) 8(35)

1-hr PM2.5 (µg/m3)b Readings on 16 Dec 2014

View reading for:

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

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 16 Dec 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 35 35 34 28 25 21 20 20 24 33 41 52
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 53 54 52 52 52 53 49 47 43 45 41 -

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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