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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 17 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 7(5) 26(26) 20(-) 40(17) 0.4(4) 15(55)
South 5(3) 26(26) 7(-) 44(19) 0.4(4) 13(52)
East 7(4) 27(27) 10(-) 62(26) 0.4(4) 18(57)
West 2(1) 30(30) 15(-) 62(26) 0.4(4) 15(55)
Central 7(4) 24(24) 35(-) 60(26) 0.3(3) 11(46)

1-hr PM2.5 (µg/m3)b Readings on 17 Jan 2015

View reading for:

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

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 17 Jan 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 52 54 55 57 58 59 59 59 58 57 56 56
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 55 54 52 48 43 45 47 49 48 45 42 -

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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