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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 Dec 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 6(4) 23(23) 32(-) 42(18) 0.3(3) 12(50)
South 4(3) 22(22) 7(-) 26(11) 0.4(4) 11(44)
East 5(3) 20(20) 15(-) 47(20) 0.3(3) 12(51)
West 5(3) 27(27) 28(-) 20(8) 0.5(5) 15(54)
Central 9(6) 20(20) 58(-) 35(15) 0.3(3) 10(44)

1-hr PM2.5 (µg/m3)b Readings on 12 Dec 2014

View reading for:

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

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 12 Dec 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 52 53 52 53 52 51 46 43 42 50 53 54
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 53 53 52 52 50 49 45 51 48 45 38 36

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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