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Pollutant Concentrations

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

Readings on 18 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) 39(39) 62(-) 14(6) 0.7(7) 21(61)
South 7(4) 34(34) 53(-) 11(5) 0.5(5) 24(64)
East 12(8) 29(29) 28(-) 14(6) 0.4(4) 21(62)
West 6(3) 42(42) 54(-) 16(7) 0.7(7) 29(70)
Central 20(12) 32(32) 54(-) 16(7) 0.7(7) 21(61)

1-hr PM2.5 (µg/m3)b Readings on 17 Oct 2014

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 7 17 25 25 30 28 30 29 23 14 13 14
South 20 20 19 16 17 21 17 27 29 32 38 36
East 15 20 18 16 22 22 26 23 22 28 20 24
West 24 31 28 29 35 30 41 37 37 37 30 30
Central 16 14 14 24 21 19 19 20 21 17 20 17
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 18 20 14 12 20 14 14 12 22 32 32 28
South 29 44 16 33 15 21 19 20 21 24 19 22
East 18 21 17 21 23 21 20 21 24 24 25 26
West 32 44 33 13 14 21 27 19 19 27 28 26
Central 16 26 11 36 25 28 27 24 22 23 26 23

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 17 Oct 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 58 58 59 61 63 64 66 67 67 67 66 65
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 64 67 64 65 60 61 60 60 61 62 65 66

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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