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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 02 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 10(6) 33(33) 22(-) 36(15) 0.3(3) 17(56)
South 5(3) 36(36) 18(-) 33(14) 0.4(4) 15(54)
East 6(4) 31(31) 11(-) 62(26) 0.3(3) 19(59)
West 3(2) 35(35) 15(-) 40(17) 0.4(4) 18(57)
Central 4(3) 32(32) 36(-) 57(24) 0.3(3) 12(51)

1-hr PM2.5 (µg/m3)b Readings on 02 Jan 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 15 15 16 18 16 20 18 15 18 17 19 20
South 10 10 9 12 12 10 10 11 14 20 24 25
East 15 18 20 18 11 19 16 20 15 20 25 18
West 16 15 15 10 12 13 7 21 20 25 28 23
Central 7 6 7 14 7 7 11 15 17 10 13 13
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 11 14 11 16 13 16 12 16 19 23 30 -
South 25 22 27 14 13 12 18 11 13 18 13 -
East 16 20 19 16 19 17 24 22 21 26 23 -
West 23 17 16 18 16 18 24 15 18 18 21 -
Central 15 10 13 12 9 15 16 17 14 17 18 -

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 02 Jan 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 52 52 52 53 52 52 52 53 55 57 59 60
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 60 58 57 56 55 54 56 56 57 57 59 -

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.