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Pollutant Concentrations

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

Readings on 15 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 9(5) 43(43) 62(-) 6(3) 0.8(8) 25(66)
South 12(8) 38(38) 69(-) 18(8) 0.5(5) 27(68)
East 11(7) 29(29) 21(-) 36(15) 0.4(4) 24(64)
West 4(3) 48(48) 62(-) 24(10) 0.7(7) 30(71)
Central 19(12) 38(38) 66(-) 18(8) 0.7(7) 25(66)

1-hr PM2.5 (µg/m3)b Readings on 14 Oct 2014

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 33 42 31 28 27 29 30 30 20 14 14 21
South 13 22 28 28 19 16 28 25 25 36 40 37
East 24 26 26 32 35 21 28 35 28 18 17 19
West 40 45 38 31 27 28 19 29 25 25 21 31
Central 32 32 36 23 24 18 23 16 34 28 17 20
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 23 24 25 22 21 30 18 30 30 12 15 33
South 40 40 41 14 8 32 27 27 23 27 30 32
East 21 21 29 15 22 26 24 23 21 21 22 16
West 25 27 23 31 18 13 25 40 43 47 35 27
Central 17 28 40 13 15 22 32 26 32 30 24 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 14 Oct 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 69 70 73 73 70 67 65 66 67 67 65 64
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 65 67 69 67 63 60 62 67 69 70 68 67

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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