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Pollutant Concentrations

Air quality readings will be available hourly from 1am to 12am.

Readings on 06 Oct 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 3(2) 15(15) 42(-) 18(8) 0.4(4) 8(34)
South 14(9) 14(14) 44(-) 18(7) 0.5(5) 7(31)
East 28(17) 15(15) 17(-) 30(13) 0.3(3) 10(41)
West 8(5) 13(13) 36(-) 19(8) 0.4(4) 7(30)
Central 24(15) 14(14) 48(-) 31(13) 0.5(5) 8(34)

1-hr PM2.5 (µg/m3)b Readings on 05 Oct 2014

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 9 6 7 1 1 2 8 3 4 6 3 5
South 6 4 5 2 1 2 1 2 3 5 6 6
East 16 9 11 5 1 1 5 1 7 5 5 3
West 11 6 2 4 2 1 2 4 4 4 3 11
Central 7 11 8 2 2 2 4 1 3 3 3 4
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 7 9 9 11 10 8 12 16 16 12 16 16
South 14 13 16 10 6 6 4 6 8 13 20 18
East 13 21 9 14 10 8 6 13 16 20 18 22
West 8 13 9 5 5 12 8 11 13 9 11 13
Central 15 16 13 10 8 8 12 8 11 13 14 17

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 05 Oct 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 57 44 33 23 15 8 10 11 14 15 17 20
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 30 44 51 49 40 36 34 38 44 51 53 55

Hourly updates of 3-hr PSI readings are provided from 1am to 12am. The 3-hr PSI readings are calculated based on PM2.5 concentrations only.

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