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Pollutant Concentrations

Readings on 27 Apr 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 4(2) 21(21) 14(-) 26(11) 0.4(4) 11(46)
South 7(4) 17(17) 31(-) 26(11) 0.4(4) 8(34)
East 9(6) 13(13) 12(-) 29(12) 0.6(6) 8(35)
West 3(2) 21(21) 11(-) 37(16) 0.4(4) 10(41)
Central 3(2) 17(17) 37(-) 20(8) 0.3(3) 9(36)

1-hr PM2.5 (µg/m3)b Readings on 26 Apr 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 12 16 20 22 15 8 6 7 8 29 8 21
South 16 7 12 9 10 6 3 10 4 8 10 9
East 12 9 18 12 11 6 4 5 4 8 7 10
West 8 12 10 7 8 9 18 19 9 14 17 14
Central 14 8 10 11 13 7 6 11 7 4 10 10
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 5 4 10 3 6 3 5 13 18 12 12 5
South 13 5 8 12 6 5 9 4 7 11 6 8
East 8 4 10 17 5 5 6 12 7 7 6 8
West 6 7 14 8 5 6 7 9 6 6 8 7
Central 10 8 15 12 9 6 8 7 4 6 4 5

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 26 Apr 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 51 47 51 51 51 43 36 34 33 40 41 50
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 44 37 36 38 39 30 25 29 34 36 33 31



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.

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