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Pollutant Concentrations

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

Readings on 17 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 7(4) 37(37) 52(-) 19(8) 0.7(7) 22(62)
South 5(3) 30(30) 52(-) 13(6) 0.5(5) 19(59)
East 9(5) 25(25) 27(-) 11(5) 0.5(5) 19(59)
West 3(2) 41(41) 56(-) 10(4) 0.7(7) 27(67)
Central 18(11) 31(31) 54(-) 18(8) 0.6(6) 19(59)

1-hr PM2.5 (µg/m3)b Readings on 16 Oct 2014

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 43 31 18 22 25 23 27 25 25 18 65 31
South 24 19 16 17 18 19 20 18 30 23 69 24
East 26 22 20 18 20 22 18 21 23 19 64 15
West 40 35 33 33 26 35 36 40 39 33 83 31
Central 26 21 23 13 26 22 21 27 37 23 67 14
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 26 15 9 17 15 12 14 10 11 39 19 6
South 32 2 3 12 7 26 38 16 12 14 20 23
East 11 25 17 9 19 14 27 14 18 26 19 28
West 36 9 10 8 15 14 22 23 16 25 25 21
Central 22 18 13 11 7 9 29 18 15 22 21 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 16 Oct 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 68 69 67 63 62 63 64 66 68 68 68 65
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 65 61 56 49 48 52 58 59 59 58 60 62

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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