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Pollutant Concentrations

Air quality readings will be available hourly from 1am to 12am.

Readings on 12 Oct 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 13(8) 69(60) 50(-) 28(12) 0.8(8) 41(83)
South 13(8) 65(58) 77(-) 23(10) 0.9(9) 51(95)
East 12(8) 55(53) 40(-) 33(14) 0.6(6) 47(91)
West 34(21) 68(59) 53(-) 23(10) 0.9(9) 51(95)
Central 22(14) 61(56) 77(-) 44(19) 0.9(9) 44(87)

1-hr PM2.5 (µg/m3)b Readings on 11 Oct 2014

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 29 35 37 36 36 34 28 29 35 40 47 51
South 32 33 32 37 31 39 37 44 46 49 56 69
East 34 36 37 34 31 33 38 45 41 43 52 51
West 29 28 33 30 32 34 39 48 49 48 48 64
Central 31 29 31 30 32 30 32 33 44 38 51 47
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 49 52 44 31 33 38 38 38 43 48 63 59
South 69 78 68 43 55 46 51 58 51 62 60 67
East 52 58 62 42 47 48 52 50 60 64 58 60
West 70 78 62 59 56 54 53 66 64 61 55 57
Central 55 53 60 45 48 44 50 46 55 55 53 57

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 11 Oct 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 71 72 74 75 75 75 75 78 82 85 89 94
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 101 106 106 101 94 89 91 93 96 99 102 104

Hourly updates of 3-hr PSI readings are provided from 1am to 12am. The 3-hr PSI readings are calculated based on PM2.5 concentrations only.

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