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 29 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) 19(19) 39(-) 4(2) 0.6(6) 9(37)
South 21(13) 14(14) 38(-) 5(2) 0.4(4) 7(28)
East 22(14) 15(15) 23(-) 25(11) 0.6(6) 10(41)
West 7(4) 13(13) 23(-) 17(7) 0.4(4) 7(29)
Central 10(6) 13(13) 39(-) 16(7) 0.6(6) 7(29)

1-hr PM2.5 (µg/m3)b Readings on 29 Nov 2014

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 13 10 5 5 5 8 7 5 8 13 8 21
South 4 4 3 4 5 7 3 5 7 11 5 11
East 17 13 7 3 4 8 5 4 4 15 4 9
West 3 3 5 7 3 3 2 3 3 4 16 19
Central 5 6 3 4 5 4 3 6 5 5 6 6
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 12 15 2 3 13 16 12 7 4 2 12 -
South 22 13 1 6 13 24 1 1 1 3 3 -
East 20 15 1 6 10 16 12 16 13 10 18 -
West 9 8 8 18 18 2 2 5 1 8 7 -
Central 19 22 1 3 16 14 2 3 5 6 7 -

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 29 Nov 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 35 31 28 23 19 21 20 21 19 27 31 42
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 51 54 47 34 33 50 47 37 24 24 28 -

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