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Pollutant Concentrations

Readings on 31 May 2016

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 14(9) 27(27) 27(-) 50(21) 0.4(4) 15(55)
South 20(13) 25(25) 46(-) 28(12) 0.3(3) 13(52)
East 25(16) 26(26) 50(-) 44(19) 0.5(5) 16(55)
West 19(12) 21(21) 19(-) 43(18) 0.2(2) 10(41)
Central 19(12) 19(19) 14(-) 52(22) 0.3(3) 11(46)

Note: The numbers in brackets refer to PSI sub-indices.

1-hr PM2.5 (µg/m3)b Readings on 31 May 2016

View reading for:

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

Note:
The numbers in brackets refer to PSI sub-indices.
a Sub-index for nitrogen dioxide is reported only when the 1-hour concentration exceeds 1130 µg/m3.
b There is no sub-index for 1-h PM2.5.

3-hr PSI Readings from 1am to 12am on 31 May 2016

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 47 45 45 49 53 54 56 55 53 48 36 39
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 41 41 39 - - - - - - - - -



The real-time data is automatically published as soon as it is generated by our air monitoring stations. The data is subject to verification and correction subsequently if necessary.