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Pollutant Concentrations

Readings on 19 Feb 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 5(3) 21(21) 34(-) 23(10) 0.4(4) 11(46)
South 16(10) 22(22) 13(-) 19(8) 0.4(4) 11(44)
East 8(5) 20(20) 6(-) 27(11) 0.6(6) 13(53)
West 4(2) 21(21) 6(-) 31(13) 0.5(5) 11(46)
Central 9(6) 21(21) 20(-) 31(13) 0.3(3) 10(43)

1-hr PM2.5 (µg/m3)b Readings on 18 Feb 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 11 11 9 8 11 11 11 12 11 16 14 15
South 6 4 9 8 14 14 7 16 15 14 25 15
East 9 12 17 10 37 11 6 21 27 17 9 9
West 10 15 12 9 11 16 5 14 15 15 17 20
Central 12 10 15 7 12 13 13 7 11 12 8 10
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 14 9 7 9 11 11 11 9 10 9 9 17
South 16 17 14 7 16 7 2 5 4 4 7 7
East 19 10 11 7 14 11 21 13 6 9 9 8
West 17 12 8 15 11 3 3 3 15 5 9 6
Central 14 12 8 6 6 10 6 10 10 10 15 11

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 Feb 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 43 43 45 43 52 52 52 49 52 54 54 54
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 54 53 51 42 41 40 39 35 35 34 36 37



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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