Home   Haze Updates   Pollutant Concentrations

Pollutant Concentrations

Air quality readings will be available hourly from 7am to 11pm. Air quality readings from 12am to 6am will be made available at 7am on the same day.

 

Readings on 11 Nov 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) 38(38) 43(-) 11(4) 0.5(5) 22(62)
South 10(6) 33(33) 74(-) 5(2) 0.8(8) 22(62)
East 8(5) 26(26) 39(-) 9(4) 0.7(7) 19(58)
West 11(7) 41(41) 72(-) 13(6) 0.9(9) 26(67)
Central 10(6) 30(30) 83(-) 22(9) 1.1(11) 18(58)

1-hr PM2.5 (µg/m3)b Readings on 11 Nov 2014

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 25 39 30 30 28 29 20 30 33 40 26 21
South 10 17 14 13 22 14 16 26 28 27 37 52
East 11 11 15 15 16 13 20 11 19 29 24 32
West 24 29 27 29 31 25 30 34 29 40 36 36
Central 8 14 11 14 13 16 20 13 23 18 12 28
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 22 23 23 8 10 15 12 6 12 10 9 -
South 32 37 18 10 8 25 21 22 25 24 24 -
East 26 22 38 8 9 19 25 18 16 17 22 -
West 44 23 22 22 21 16 15 23 26 20 17 -
Central 26 35 21 16 6 15 20 28 22 24 28 -

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 11 Nov 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 53 56 59 61 61 61 61 61 64 68 69 72
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 72 72 68 63 56 54 55 58 59 60 60 -

Hourly updates of 3-hr PSI readings are provided from 7am to 11pm. The 3-hr PSI readings from 12am to 6am will be made available at 7am on the same day. The 3-hr PSI readings are calculated based on PM2.5 concentrations only.

Back to Top