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Pollutant Concentrations

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

Readings on 24 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(4) 53(52) 48(-) 56(24) 0.6(6) 32(73)
South 38(23) 46(46) 69(-) 23(10) 0.6(6) 34(76)
East 29(18) 41(41) 32(-) 58(25) 0.2(2) 35(77)
West 23(14) 48(48) 41(-) 42(18) 0.6(6) 32(74)
Central 66(41) 48(48) 78(-) 38(16) 0.6(6) 36(78)

1-hr PM2.5 (µg/m3)b Readings on 23 Oct 2014

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 31 35 51 50 40 37 37 40 45 38 37 36
South 30 23 30 29 39 42 35 26 37 52 56 50
East 32 30 26 24 30 42 35 40 50 48 41 38
West 35 34 33 50 43 40 35 55 42 44 37 38
Central 34 32 32 32 30 39 33 53 43 43 47 42
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 29 22 16 21 21 24 19 19 23 23 33 39
South 46 46 37 27 29 25 23 23 8 24 42 35
East 31 34 63 37 17 24 30 22 31 39 38 36
West 32 32 25 20 16 24 15 23 23 18 22 43
Central 48 40 31 31 34 25 29 18 23 43 47 31

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 23 Oct 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 75 74 74 76 78 80 79 82 83 87 87 86
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 83 80 77 74 69 66 64 63 62 64 70 76

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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