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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 17 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 5(3) 22(22) 32(-) 14(6) 0.3(3) 11(44)
South 8(5) 24(24) 35(-) 5(2) 0.5(5) 14(53)
East 5(3) 17(17) 16(-) 26(11) 0.4(4) 12(50)
West 5(3) 20(20) 30(-) 21(9) 0.5(5) 11(45)
Central 10(7) 18(18) 33(-) 18(8) 0.5(5) 11(48)

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

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 25 13 8 9 12 12 11 9 12 9 11 8
South 10 11 8 8 7 11 5 13 10 29 42 34
East 23 20 16 15 16 13 11 6 10 23 16 10
West 13 6 11 7 8 4 19 9 8 14 16 14
Central 11 13 11 10 12 12 12 15 11 5 23 21
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 10 10 16 7 5 5 6 4 8 9 12 -
South 15 31 31 10 7 3 11 6 9 3 3 -
East 7 15 16 6 10 6 8 3 6 8 11 -
West 17 15 24 18 5 3 5 9 3 8 10 -
Central 5 17 30 3 6 8 8 10 9 5 3 -

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 Nov 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 53 54 52 46 44 44 46 45 45 51 55 58
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 56 55 57 56 52 29 26 26 28 27 29 -

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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