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 13 Jan 2015

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 9(5) 20(20) 16(-) 30(13) 0.4(4) 9(36)
South 9(5) 24(24) 1(-) 34(14) 0.4(4) 9(36)
East 6(4) 19(19) 6(-) 49(21) 0.4(4) 11(47)
West 2(1) 24(24) 11(-) 47(20) 0.4(4) 10(42)
Central 8(5) 21(21) 24(-) 52(22) 0.3(3) 8(32)

1-hr PM2.5 (µg/m3)b Readings on 13 Jan 2015

View reading for:

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

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 13 Jan 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 34 34 35 35 32 33 32 37 39 48 52 53
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 52 51 49 46 44 43 39 34 26 25 24 -

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