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Pollutant Concentrations

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

Readings on 03 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) 40(-) 49(21) 0.5(5) 30(72)
South 13(8) 44(44) 34(-) 39(17) 0.4(4) 34(75)
East 10(6) 39(39) 20(-) 46(20) 0.5(5) 31(73)
West 31(19) 52(51) 41(-) 36(15) 0.4(4) 37(79)
Central 22(14) 44(44) 41(-) 53(22) 0.5(5) 30(72)

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

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 32 28 28 27 28 27 24 30 31 41 38 31
South 21 21 25 28 32 27 27 38 31 37 42 49
East 29 27 27 27 27 24 31 29 29 34 30 39
West 28 30 24 28 27 29 32 39 36 35 37 42
Central 27 26 23 24 27 23 25 26 28 26 31 29
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 37 38 39 33 28 27 25 32 46 42 30 20
South 50 48 48 48 44 37 28 29 31 25 21 22
East 32 39 34 30 30 37 39 40 39 26 26 30
West 40 51 49 50 45 45 44 41 47 31 31 33
Central 41 40 39 41 37 37 35 28 37 28 25 24

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 Oct 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 70 69 67 67 68 68 68 70 72 74 76 78
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 80 83 85 85 82 80 78 77 78 77 74 69

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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