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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 26 Nov 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 2(2) 22(22) 22(-) 10(4) 0.4(4) 11(48)
South 9(5) 19(19) 32(-) 14(6) 0.6(6) 11(44)
East 10(6) 25(25) 47(-) 5(2) 0.6(6) 16(56)
West 5(3) 19(19) 10(-) 31(13) 0.4(4) 10(42)
Central 10(7) 18(18) 42(-) 24(10) 0.5(5) 11(45)

1-hr PM2.5 (µg/m3)b Readings on 26 Nov 2014

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 7 9 16 16 12 10 9 9 7 8 13 17
South 5 11 16 5 2 3 7 4 8 19 21 15
East 6 10 11 21 21 22 24 13 23 20 15 18
West 14 13 14 17 12 11 6 6 6 7 15 17
Central 12 20 12 8 7 6 9 12 12 6 12 10
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 16 18 16 12 12 6 7 9 9 13 13 -
South 12 7 12 14 14 10 7 16 11 13 14 -
East 14 20 25 28 20 17 12 10 15 10 13 -
West 9 5 16 5 13 6 4 11 7 8 5 -
Central 9 7 9 28 11 8 9 7 10 12 9 -

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 26 Nov 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 38 44 49 52 52 48 45 42 43 44 52 53
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 53 52 52 54 55 53 43 39 40 44 45 -

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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