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Pollutant Concentrations

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

Readings on 07 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 4(3) 75(63) 39(-) 69(29) 1.1(11) 50(94)
South 19(12) 76(63) 30(-) 52(22) 1.2(12) 64(110)
East 30(19) 64(57) 18(-) 62(26) 1.2(12) 57(103)
West 17(10) 74(63) 24(-) 61(26) 1.2(12) 59(105)
Central 34(21) 67(59) 39(-) 87(37) 1.3(13) 55(99)

1-hr PM2.5 (µg/m3)b Readings on 06 Oct 2014

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 15 13 12 13 14 15 18 20 24 25 25 38
South 15 17 15 18 12 13 26 22 39 33 69 73
East 20 23 15 17 16 12 18 25 26 34 43 60
West 9 15 13 16 12 19 21 31 23 27 48 60
Central 15 17 11 14 13 12 15 17 20 29 40 62
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 64 86 83 91 100 82 87 80 45 75 91 83
South 96 100 88 96 92 131 111 83 84 100 110 96
East 53 72 70 69 92 119 116 91 91 97 98 96
West 76 91 77 100 116 122 103 93 81 91 89 84
Central 68 73 86 93 78 113 112 77 81 90 87 88

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 06 Oct 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 55 56 54 55 53 54 55 59 63 67 75 88
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 104 118 125 132 136 147 153 149 136 131 134 139

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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