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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 08 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) 16(16) 17(-) 5(2) 0.4(4) 8(34)
South 11(7) 16(16) 36(-) 9(4) 0.4(4) 9(36)
East 9(5) 16(16) 14(-) 15(7) 0.2(2) 10(41)
West 3(2) 13(13) 52(-) 22(9) 0.5(5) 7(29)
Central 6(4) 12(12) 34(-) 22(9) 0.3(3) 7(27)

1-hr PM2.5 (µg/m3)b Readings on 08 Jan 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 14 3 5 3 4 3 7 5 6 6 8 11
South 3 3 2 3 2 2 5 4 5 10 8 17
East 12 7 15 9 14 18 13 5 6 4 10 11
West 9 4 2 6 3 6 4 6 4 9 4 12
Central 5 2 4 3 2 5 4 3 7 5 6 8
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 25 9 8 4 7 9 6 6 9 9 9 -
South 15 15 21 14 18 7 12 11 10 8 8 -
East 15 9 3 6 12 10 7 8 9 8 10 -
West 9 6 8 8 7 4 10 12 9 9 7 -
Central 5 17 9 15 6 4 6 11 8 7 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 08 Jan 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 42 33 25 20 22 23 26 25 24 24 27 35
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 45 51 48 42 41 36 34 34 37 37 35 -

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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