Home   Haze Updates   Pollutant Concentrations

Pollutant Concentrations

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

Readings on 19 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 4(2) 46(46) 46(-) 25(11) 0.8(8) 30(71)
South 13(8) 46(46) 55(-) 17(7) 0.9(9) 36(78)
East 20(13) 42(42) 24(-) 40(17) 0.8(8) 36(78)
West 7(5) 39(39) 47(-) 8(3) 0.8(8) 28(69)
Central 29(18) 46(46) 57(-) 28(12) 1.1(11) 32(74)

1-hr PM2.5 (µg/m3)b Readings on 18 Oct 2014

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 49 45 40 46 46 25 12 12 16 14 15 19
South 22 31 31 32 27 32 22 21 19 22 42 54
East 27 26 26 29 34 33 33 29 24 27 25 36
West 24 25 22 27 22 17 20 19 22 26 24 33
Central 20 24 30 30 32 34 11 28 17 19 22 31
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 26 32 36 31 25 26 29 33 47 37 26 26
South 50 13 27 32 49 56 41 27 42 54 59 53
East 33 59 35 35 53 42 41 28 36 41 51 58
West 33 30 22 22 28 30 36 40 38 34 43 41
Central 35 32 45 28 45 33 42 31 61 45 38 35

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 18 Oct 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 67 69 71 72 73 73 68 64 61 61 62 68
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 73 76 76 73 76 78 81 78 80 82 86 86

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.

Back to Top