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Pollutant Concentrations

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

Readings on 05 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 6(3) 37(37) 33(-) 51(21) 0.6(6) 25(65)
South 18(11) 36(36) 24(-) 29(12) 0.6(6) 24(64)
East 35(22) 35(35) 14(-) 32(13) 0.4(4) 26(67)
West 11(7) 36(36) 11(-) 54(23) 0.5(5) 24(64)
Central 36(22) 34(34) 21(-) 42(18) 0.7(7) 23(63)

1-hr PM2.5 (µg/m3)b Readings on 04 Oct 2014

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 19 18 19 23 21 16 23 18 18 21 33 28
South 19 16 15 14 15 16 14 11 20 23 32 18
East 25 19 23 19 16 16 18 18 17 16 23 40
West 21 20 19 17 18 16 11 18 19 32 34 19
Central 22 21 13 18 14 12 18 7 11 17 32 27
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 14 16 29 27 36 37 36 35 30 29 28 18
South 10 23 28 51 42 33 22 29 29 36 31 19
East 15 29 25 36 39 29 37 36 32 40 40 19
West 30 47 34 32 24 29 26 27 22 29 15 7
Central 23 28 28 26 34 30 29 31 35 33 27 11

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 04 Oct 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 61 61 59 58 57 56 56 55 55 57 63 67
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 66 65 66 72 74 75 74 73 72 73 72 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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