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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 06 Jan 2015

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 10(6) 21(21) 27(-) 6(2) 0.4(4) 11(47)
South 7(4) 20(20) 14(-) 14(6) 0.5(5) 11(45)
East 9(5) 21(21) 23(-) 10(4) 0.5(5) 13(52)
West 3(2) 18(18) 25(-) 23(10) 0.5(5) 9(37)
Central 6(4) 18(18) 32(-) 20(9) 0.6(6) 9(36)

1-hr PM2.5 (µg/m3)b Readings on 06 Jan 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 20 24 16 9 10 11 10 10 14 15 15 12
South 7 7 9 4 8 5 7 7 10 17 19 23
East 19 29 20 11 14 13 13 15 6 19 16 12
West 8 11 8 7 6 7 9 7 8 13 19 12
Central 16 7 7 6 8 4 8 8 8 5 9 13
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 10 9 9 10 6 3 5 7 10 8 6 -
South 25 24 15 27 12 6 5 4 3 5 3 -
East 14 16 12 19 14 4 7 6 8 11 5 -
West 15 14 11 18 12 6 3 3 4 5 6 -
Central 11 15 12 21 13 5 5 3 4 5 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 06 Jan 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 51 53 53 48 39 34 37 37 39 45 52 54
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 54 54 53 55 53 49 30 20 21 24 26 -

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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