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Pollutant Concentrations

Readings on 23 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) 17(17) 31(-) 32(14) 0.3(3) 8(33)
South 5(3) 20(20) 9(-) 30(13) 0.3(3) 8(32)
East 9(6) 17(17) 7(-) 33(14) 0.3(3) 11(46)
West 4(3) 21(21) 9(-) 43(18) 0.4(4) 10(41)
Central 6(4) 19(19) 29(-) 40(17) 0.3(3) 10(40)

1-hr PM2.5 (µg/m3)b Readings on 22 Feb 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 9 12 6 6 7 5 6 8 3 6 6 10
South 13 4 6 11 8 8 3 11 8 5 4 10
East 9 9 11 26 16 13 11 13 7 8 8 17
West 10 4 6 8 7 13 13 13 11 12 17 16
Central 8 12 10 13 11 5 5 9 8 4 7 14
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 13 16 11 11 14 8 8 8 6 3 4 6
South 8 7 17 12 12 8 5 6 6 4 3 3
East 16 16 8 10 9 6 7 15 7 7 6 10
West 18 10 17 7 14 8 3 5 6 7 6 6
Central 9 13 6 13 8 9 14 16 11 11 6 8

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 22 Feb 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 43 40 36 40 42 44 36 38 36 35 32 40
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 48 52 51 49 47 41 37 35 34 33 26 25



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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