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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 07 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) 18(18) 29(-) 2(1) 0.5(5) 10(41)
South 9(5) 17(17) 34(-) 11(5) 0.4(4) 9(39)
East 11(7) 15(15) 18(-) 13(5) 0.2(2) 10(40)
West 3(2) 18(18) 16(-) 18(8) 0.5(5) 9(39)
Central 7(4) 14(14) 37(-) 22(9) 0.4(4) 7(31)

1-hr PM2.5 (µg/m3)b Readings on 07 Jan 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 9 4 6 5 3 5 7 6 9 16 8 8
South 5 8 4 5 5 5 6 5 5 18 26 8
East 9 8 10 10 5 8 7 9 8 10 12 9
West 7 5 7 14 4 6 8 7 14 9 15 20
Central 8 2 8 3 6 4 5 12 9 5 6 9
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 4 15 18 22 6 8 10 10 18 15 16 -
South 7 18 19 19 3 5 7 13 10 6 9 -
East 9 8 23 6 8 5 17 15 9 10 10 -
West 23 15 7 2 6 6 7 10 9 9 9 -
Central 8 7 9 13 5 5 9 14 8 8 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 07 Jan 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 30 29 28 28 27 25 23 28 32 39 47 50
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 48 47 52 52 46 33 29 39 45 45 42 -

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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