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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 09 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 10(6) 17(17) 34(-) 26(11) 0.6(6) 9(38)
South 21(13) 16(16) 61(-) 20(9) 0.4(4) 9(37)
East 11(7) 14(14) 34(-) 27(12) 0.5(5) 9(37)
West 22(14) 21(21) 60(-) 28(12) 0.5(5) 13(51)
Central 22(14) 16(16) 53(-) 36(15) 0.6(6) 10(40)

1-hr PM2.5 (µg/m3)b Readings on 09 Nov 2014

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 8 11 7 2 3 4 6 6 5 10 9 12
South 2 6 3 3 5 7 5 5 7 6 8 15
East 6 7 12 4 2 5 8 6 7 7 10 8
West 6 4 5 5 2 4 3 5 4 7 10 13
Central 4 5 5 4 4 6 5 6 4 4 10 13
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 6 8 11 9 10 15 14 10 19 16 13 -
South 11 13 13 10 12 12 10 17 13 12 16 -
East 8 11 9 13 6 10 13 19 14 13 15 -
West 9 9 12 18 12 27 28 27 29 31 26 -
Central 14 18 10 10 10 13 15 15 20 20 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 09 Nov 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 25 19 25 23 19 17 19 23 23 24 30 39
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 43 47 45 48 46 51 53 56 57 58 58 -

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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