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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 29 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 4(3) 22(22) 44(-) 16(7) 0.3(3) 12(48)
South 19(12) 20(20) 32(-) 15(6) 0.3(3) 11(46)
East 32(20) 17(17) 22(-) 35(15) 0.5(5) 10(41)
West 6(4) 21(21) 16(-) 26(11) 0.4(4) 12(48)
Central 10(6) 21(21) 36(-) 26(11) 0.4(4) 12(49)

1-hr PM2.5 (µg/m3)b Readings on 28 Nov 2014

View reading for:

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

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 28 Nov 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 52 51 49 51 52 52 51 49 50 52 53 52
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 53 54 53 49 37 40 45 42 33 26 29 32

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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