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Pollutant Concentrations

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

Readings on 02 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 10(6) 48(48) 17(-) 23(10) 0.3(3) 33(75)
South 10(6) 45(45) 22(-) 28(12) 0.4(4) 32(74)
East 12(8) 37(37) 14(-) 31(13) 0.5(5) 28(69)
West 17(10) 54(52) 44(-) 34(14) 0.4(4) 39(81)
Central 19(12) 43(43) 38(-) 42(18) 0.4(4) 29(70)

1-hr PM2.5 (µg/m3)b Readings on 01 Oct 2014

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 37 40 41 44 43 43 43 38 38 25 16 26
South 32 35 36 45 46 40 27 23 26 34 37 39
East 33 36 36 39 30 31 25 18 24 24 26 25
West 45 44 45 47 48 44 51 66 51 41 35 30
Central 33 33 39 40 46 41 31 29 23 23 15 26
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 32 37 26 22 34 39 26 19 28 24 35 39
South 44 41 42 31 35 35 18 10 20 26 26 28
East 27 26 24 26 32 23 19 25 23 32 30 30
West 33 34 36 34 46 36 30 19 24 22 33 30
Central 27 24 25 26 27 34 26 19 23 22 24 28

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 01 Oct 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 77 78 80 83 84 85 82 79 76 74 70 69
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 70 73 73 72 72 74 72 66 62 63 67 70

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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