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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 27 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 2(1) 24(24) 22(-) 13(6) 0.3(3) 12(51)
South 22(14) 22(22) 52(-) 12(5) 0.4(4) 13(52)
East 19(12) 21(21) 14(-) 34(14) 0.7(7) 14(53)
West 9(6) 23(23) 31(-) 25(11) 0.4(4) 12(51)
Central 10(6) 20(20) 56(-) 26(11) 0.5(5) 11(46)

1-hr PM2.5 (µg/m3)b Readings on 27 Nov 2014

View reading for:

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

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 27 Nov 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 40 41 50 52 53 53 53 53 56 59 60 58
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 55 52 48 45 37 32 27 29 36 47 52 -

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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