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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 30 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 5(3) 42(42) 57(-) 31(13) 0.6(6) 27(68)
South 8(5) 36(36) 66(-) 25(10) 0.5(5) 26(66)
East 10(6) 38(38) 50(-) 35(15) 0.6(6) 30(72)
West 9(6) 48(48) 57(-) 51(22) 0.6(6) 32(73)
Central 12(8) 36(36) 75(-) 13(6) 0.7(7) 25(66)

1-hr PM2.5 (µg/m3)b Readings on 30 Oct 2014

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 32 38 43 38 38 38 29 22 18 13 14 18
South 21 5 13 25 31 37 29 24 32 27 26 28
East 24 22 23 25 34 32 36 42 37 36 29 29
West 34 36 30 29 33 29 25 24 21 22 19 30
Central 21 13 17 28 37 33 24 22 23 16 21 27
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 26 33 26 13 31 28 23 23 23 23 15 -
South 41 39 15 24 44 37 24 9 14 21 28 -
East 37 33 34 34 27 28 24 23 24 38 30 -
West 40 36 44 38 35 40 28 28 38 35 33 -
Central 24 33 34 22 37 29 27 17 25 27 26 -

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 30 Oct 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 67 66 65 66 71 74 74 71 68 66 64 64
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 68 73 75 72 72 73 72 67 64 65 68 -

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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