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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 03 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 13(8) 70(60) 60(-) 55(23) 0.8(8) 44(87)
South 13(8) 58(54) 41(-) 40(17) 0.7(7) 50(94)
East 7(5) 55(53) 11(-) 61(26) 0.4(4) 48(91)
West 13(8) 61(56) 55(-) 48(20) 0.8(8) 48(92)
Central 27(17) 58(54) 48(-) 77(33) 1.0(10) 46(89)

1-hr PM2.5 (µg/m3)b Readings on 02 Nov 2014

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 27 28 19 21 22 25 24 17 15 27 24 33
South 25 17 18 16 16 16 16 20 25 35 44 59
East 26 22 25 16 21 19 24 18 27 27 34 52
West 24 19 24 14 15 18 20 31 23 24 28 37
Central 19 24 11 19 14 24 18 22 23 17 33 51
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 48 68 65 62 63 61 70 77 66 65 64 60
South 67 72 75 70 72 72 75 84 81 78 73 71
East 52 62 62 68 59 73 81 86 87 68 67 70
West 42 42 57 76 82 76 84 83 84 93 90 77
Central 43 57 63 67 70 70 79 88 84 73 65 63

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 02 Nov 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 64 64 62 59 58 58 59 61 62 64 68 77
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 86 96 104 110 113 115 119 124 127 126 122 118

Hourly updates of 3-hr PSI readings are provided from 7am to 11pm. The 3-hr PSI readings are calculated based on PM2.5 concentrations only.

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