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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 05 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 17(11) 43(43) 61(-) 26(11) 0.6(6) 26(67)
South 2(2) 42(42) 74(-) 20(9) 0.6(6) 28(69)
East 6(4) 38(38) 45(-) 21(9) 0.6(6) 30(71)
West 7(5) 45(45) 74(-) 33(14) 0.5(5) 31(72)
Central 10(6) 38(38) 75(-) 43(18) 0.8(8) 27(68)

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

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 23 27 28 24 35 38 38 39 36 28 28 26
South 24 25 20 23 21 39 28 27 31 29 61 63
East 25 28 31 30 28 33 36 54 44 38 38 32
West 32 33 30 38 31 27 33 33 29 27 38 44
Central 28 30 24 22 24 29 29 37 35 19 40 27
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 23 29 30 34 21 4 11 23 18 17 23 -
South 54 53 34 9 8 10 10 9 16 19 30 -
East 30 34 34 37 17 28 6 14 10 27 38 -
West 35 39 43 43 32 18 13 17 19 30 31 -
Central 33 37 30 42 24 22 9 16 17 27 24 -

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 Nov 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 65 67 68 68 68 71 73 77 77 75 77 78
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 80 79 78 77 70 64 55 53 53 58 64 -

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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