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Pollutant Concentrations

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

Readings on 28 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 5(3) 32(32) 43(-) 2(1) 0.7(7) 19(59)
South 5(3) 24(24) 51(-) 3(1) 0.7(7) 16(56)
East 10(6) 27(27) 31(-) 7(3) 0.7(7) 18(58)
West 4(3) 33(33) 37(-) 12(5) 0.7(7) 19(59)
Central 9(6) 24(24) 51(-) 8(4) 0.8(8) 15(55)

1-hr PM2.5 (µg/m3)b Readings on 27 Oct 2014

View reading for:

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

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 27 Oct 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 60 62 62 59 58 58 61 63 64 65 63 62
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 57 54 54 56 54 40 38 51 55 55 54 55

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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