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Pollutant Concentrations

Readings on 11 Mar 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 6(4) 23(23) 31(-) 34(15) 0.4(4) 12(51)
South 9(6) 24(24) 5(-) 26(11) 0.3(3) 12(51)
East 5(3) 18(18) 4(-) 37(16) 0.4(4) 12(49)
West 4(2) 21(21) 8(-) 37(16) 0.4(4) 11(46)
Central 8(5) 23(23) 44(-) 31(13) 0.3(3) 10(42)

1-hr PM2.5 (µg/m3)b Readings on 10 Mar 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 18 8 11 5 21 15 16 14 19 12 14 16
South 12 4 6 3 6 12 12 14 8 19 28 31
East 21 11 11 7 11 16 13 14 15 17 20 16
West 8 6 7 7 11 13 14 12 11 15 24 22
Central 12 5 7 11 8 9 14 10 10 10 12 16
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 15 15 9 7 10 9 10 13 9 10 10 5
South 26 27 19 18 14 6 8 2 3 2 3 6
East 13 11 9 11 6 7 12 13 5 9 9 6
West 13 10 9 11 17 8 6 5 8 9 12 7
Central 7 15 8 9 8 10 6 11 10 10 9 13

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 10 Mar 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 54 50 41 30 37 44 52 52 52 52 55 58
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 58 56 53 51 46 42 38 35 34 33 33 33



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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