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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 12 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 7(4) 39(39) 48(-) 30(13) 0.4(4) 23(63)
South 27(17) 45(45) 65(-) 39(16) 0.6(6) 33(75)
East 11(7) 33(33) 36(-) 38(16) 0.7(7) 26(66)
West 16(10) 44(44) 87(-) 38(16) 0.8(8) 28(69)
Central 24(15) 41(41) 85(-) 46(19) 0.8(8) 27(68)

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

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 11 20 20 18 15 24 29 28 25 34 37 35
South 41 34 31 23 13 43 40 39 31 58 56 43
East 27 24 15 28 30 23 28 24 30 40 27 30
West 33 30 25 23 18 23 26 35 28 41 48 47
Central 36 31 23 23 17 24 22 33 29 30 28 38
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 27 28 30 33 23 9 14 22 20 18 16 -
South 31 52 31 45 60 8 8 20 29 17 17 -
East 31 16 38 32 47 14 10 21 18 15 20 -
West 35 43 31 38 25 9 9 22 20 24 20 -
Central 26 27 32 46 55 4 11 24 30 16 21 -

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 Nov 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 66 69 68 65 62 63 66 71 71 75 78 82
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 78 76 74 77 80 71 60 53 58 61 60 -

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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