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Pollutant Concentrations

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

Readings on 13 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 17(10) 64(57) 39(-) 55(23) 0.7(7) 39(81)
South 13(8) 61(56) 37(-) 50(21) 0.7(7) 49(93)
East 14(9) 56(54) 13(-) 48(20) 0.5(5) 43(86)
West 14(9) 65(58) 67(-) 62(26) 0.7(7) 47(91)
Central 25(15) 58(54) 37(-) 63(26) 0.6(6) 40(83)

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

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 60 66 61 50 48 51 47 46 50 49 36 20
South 67 67 68 59 61 60 54 43 53 67 49 38
East 66 68 62 67 73 57 52 47 61 55 37 27
West 56 56 55 50 44 47 53 58 49 46 59 57
Central 58 62 57 51 51 44 47 44 50 54 39 36
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 18 14 25 32 31 36 36 32 35 34 29 19
South 46 49 55 62 50 33 28 35 32 30 43 27
East 11 30 25 35 32 31 34 38 29 32 30 32
West 23 31 41 56 65 58 42 27 42 36 46 41
Central 28 30 22 41 38 27 31 36 33 31 33 23

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 Oct 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 105 108 108 106 103 99 97 94 94 96 94 88
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 77 72 71 79 83 85 80 77 76 75 76 74

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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