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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 19 Dec 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 6(4) 18(18) 35(-) 15(6) 0.4(4) 9(36)
South 2(1) 16(16) 4(-) 17(7) 0.3(3) 9(39)
East 6(4) 18(18) 8(-) 29(12) 0.4(4) 12(48)
West 4(3) 20(20) 24(-) 18(8) 0.4(4) 10(41)
Central 2(2) 17(17) 28(-) 38(16) 0.4(4) 8(31)

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

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 15 7 9 11 5 5 6 7 6 5 13 7
South 18 8 10 10 4 3 4 8 5 6 8 9
East 9 16 25 13 18 11 18 17 19 16 13 6
West 19 24 22 9 3 7 5 12 8 5 15 11
Central 15 7 8 8 8 3 10 4 6 4 7 4
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 5 11 6 6 13 7 6 12 10 18 13 6
South 22 7 10 11 8 12 11 14 11 10 11 3
East 7 3 8 4 5 6 11 8 14 14 12 6
West 7 11 10 8 8 10 13 6 3 5 8 9
Central 12 11 10 6 6 4 8 6 14 7 7 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 18 Dec 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 53 53 53 51 45 33 31 34 38 36 38 35
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 40 37 39 34 33 32 36 37 41 42 43 37

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.

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