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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 01 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 10(6) 44(44) 57(-) 64(27) 0.5(5) 29(70)
South 20(12) 39(39) 53(-) 29(12) 0.5(5) 28(69)
East 11(7) 35(35) 30(-) 42(18) 0.2(2) 26(67)
West 9(5) 37(37) 30(-) 56(24) 0.5(5) 25(65)
Central 36(22) 40(40) 51(-) 58(25) 0.6(6) 28(69)

1-hr PM2.5 (µg/m3)b Readings on 01 Nov 2014

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 27 48 45 41 36 27 24 23 33 31 28 23
South 10 21 34 35 34 27 32 19 16 35 43 32
East 25 25 32 33 37 31 27 26 24 23 28 19
West 28 30 33 27 20 21 20 25 15 22 25 34
Central 23 29 31 33 33 24 21 25 33 13 34 37
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 16 27 29 27 30 31 24 19 23 24 18 -
South 33 21 28 35 31 27 30 28 25 26 27 -
East 28 20 23 31 23 25 23 28 24 29 22 -
West 26 27 28 25 24 19 28 25 24 26 21 -
Central 34 27 26 30 33 26 30 33 26 27 21 -

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 01 Nov 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 64 67 70 75 75 72 69 65 65 65 68 69
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 70 68 67 68 69 69 68 67 67 66 65 -

Hourly updates of 3-hr PSI readings are provided from 7am to 11pm. The 3-hr PSI readings are calculated based on PM2.5 concentrations only.

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