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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 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 11(7) 26(26) 41(-) 28(12) 0.5(5) 15(54)
South 25(15) 29(29) 67(-) 18(8) 0.5(5) 17(56)
East 13(8) 23(23) 43(-) 22(10) 0.5(5) 17(56)
West 8(5) 23(23) 61(-) 35(15) 0.5(5) 14(53)
Central 15(9) 22(22) 75(-) 33(14) 0.6(6) 13(52)

1-hr PM2.5 (µg/m3)b Readings on 07 Nov 2014

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 15 12 12 11 10 13 10 20 22 18 19 19
South 6 12 9 5 14 26 24 18 12 18 31 37
East 17 15 11 10 12 11 12 17 19 25 14 16
West 8 5 9 4 9 17 18 9 9 25 20 19
Central 5 10 10 9 5 11 12 11 17 12 8 25
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 15 21 24 23 26 14 7 2 6 13 8 -
South 30 29 12 13 36 33 9 1 3 8 15 -
East 28 22 14 22 32 22 13 6 13 17 20 -
West 27 19 21 14 14 14 16 9 13 17 18 -
Central 13 30 20 17 35 26 6 4 7 14 12 -

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 Nov 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 44 38 43 40 39 46 53 55 55 56 58 60
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 62 64 62 60 62 63 60 51 32 37 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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