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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 13 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 7(4) 29(29) 58(-) 19(8) 0.4(4) 15(54)
South 10(6) 24(24) 45(-) 27(11) 0.4(4) 15(54)
East 8(5) 21(21) 44(-) 32(13) 0.5(5) 14(53)
West 2(2) 27(27) 34(-) 32(14) 0.6(6) 14(53)
Central 8(5) 22(22) 36(-) 40(17) 0.5(5) 14(53)

1-hr PM2.5 (µg/m3)b Readings on 13 Nov 2014

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 23 27 38 26 29 28 9 8 10 8 7 15
South 21 17 15 8 7 14 6 15 17 23 32 34
East 16 9 17 26 25 20 16 7 6 7 14 10
West 30 25 24 20 25 17 12 16 19 7 12 15
Central 23 23 18 15 18 14 16 7 10 5 7 14
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 13 14 7 13 12 9 4 7 11 11 14 -
South 16 14 11 21 12 25 7 4 2 5 6 -
East 5 5 19 16 26 16 7 5 7 16 19 -
West 17 8 11 7 11 7 2 3 10 7 7 -
Central 8 12 6 22 26 12 2 2 8 12 14 -

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 13 Nov 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 61 61 62 61 61 59 57 53 48 46 51 53
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 54 52 47 51 54 55 50 32 23 31 41 -

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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