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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 03 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) 29(29) 20(-) 33(14) 0.4(4) 15(55)
South 5(3) 29(29) 30(-) 45(19) 0.4(4) 15(54)
East 7(4) 33(33) 17(-) 53(23) 0.4(4) 23(63)
West 3(2) 31(31) 16(-) 53(22) 0.4(4) 17(56)
Central 5(3) 28(28) 16(-) 63(27) 0.3(3) 12(51)

1-hr PM2.5 (µg/m3)b Readings on 03 Jan 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 24 22 20 16 15 26 23 20 14 20 17 16
South 20 14 13 18 18 15 12 16 12 20 24 22
East 31 27 34 40 28 18 21 33 26 28 24 15
West 18 24 24 16 18 15 15 18 13 16 15 23
Central 18 17 15 15 8 21 11 10 15 11 9 11
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 11 12 8 12 9 6 8 10 14 15 8 -
South 20 27 12 24 12 6 10 6 6 4 6 -
East 22 15 22 17 8 16 16 15 17 22 19 -
West 30 15 21 24 10 13 7 4 13 11 14 -
Central 18 7 15 10 5 12 16 7 11 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 03 Jan 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 61 61 62 61 60 59 57 58 57 58 57 58
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 58 57 56 55 53 51 43 43 45 47 51 -

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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