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Pollutant Concentrations

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

Readings on 08 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 20(12) 58(55) 49(-) 48(21) 0.5(5) 35(76)
South 9(6) 53(52) 30(-) 41(17) 0.5(5) 39(82)
East 18(11) 45(45) 14(-) 55(23) 0.3(3) 37(79)
West 37(23) 61(56) 40(-) 34(14) 0.5(5) 45(89)
Central 20(12) 54(53) 31(-) 60(25) 0.5(5) 35(77)

1-hr PM2.5 (µg/m3)b Readings on 07 Oct 2014

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 71 75 60 29 31 43 42 35 22 19 19 18
South 111 88 41 34 47 57 51 33 26 31 33 38
East 87 59 38 42 54 60 61 42 28 26 23 19
West 90 102 94 71 44 51 52 58 58 32 31 27
Central 85 88 36 31 43 53 47 29 21 19 19 24
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 22 30 40 40 46 38 24 23 17 26 31 26
South 39 41 45 42 35 35 24 21 17 14 23 24
East 22 26 28 45 39 24 29 24 23 23 27 34
West 35 45 54 30 30 36 24 25 22 27 25 27
Central 21 22 32 46 48 28 33 20 28 26 27 26

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 07 Oct 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 139 134 122 105 90 89 93 91 83 73 68 66
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 67 70 75 80 83 80 75 68 64 63 64 66

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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