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Pollutant Concentrations

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

Readings on 27 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 4(2) 37(37) 39(-) 43(18) 0.5(5) 21(61)
South 9(6) 27(27) 35(-) 21(9) 0.3(3) 18(58)
East 14(9) 27(27) 15(-) 27(11) 0.4(4) 20(60)
West 8(5) 33(33) 47(-) 25(10) 0.5(5) 22(62)
Central 13(8) 25(25) 42(-) 27(11) 0.4(4) 17(56)

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

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 8 17 21 36 32 24 24 31 26 18 34 35
South 15 16 13 14 15 15 13 17 23 17 34 40
East 16 10 14 21 17 14 21 21 17 17 23 21
West 21 14 16 17 14 17 23 23 27 30 28 23
Central 17 16 16 19 16 16 16 11 22 15 19 20
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 20 22 22 17 12 7 5 15 18 17 18 25
South 40 36 23 29 11 5 12 7 4 14 6 9
East 28 32 20 23 25 24 23 21 16 22 16 22
West 20 26 27 28 27 11 25 18 15 21 29 28
Central 16 23 20 21 12 13 22 12 12 16 10 18

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 Oct 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 57 56 55 57 58 59 58 59 61 61 64 65
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 68 68 66 65 61 57 55 54 54 55 55 58

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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