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Pollutant Concentrations

Readings on 25 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 4(3) 20(20) 38(-) 25(11) 0.4(4) 10(43)
South 7(5) 26(26) 25(-) 29(12) 0.3(3) 15(54)
East 8(5) 20(20) 12(-) 32(13) 0.5(5) 14(53)
West 3(2) 25(25) 37(-) 32(14) 0.4(4) 12(51)
Central 7(4) 24(24) 25(-) 41(17) 0.3(3) 13(52)

1-hr PM2.5 (µg/m3)b Readings on 24 Feb 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 5 6 5 7 8 9 15 16 14 12 10 6
South 12 11 16 14 8 9 10 15 19 21 18 32
East 10 17 16 19 16 15 17 22 13 13 13 15
West 7 8 10 10 9 12 3 14 13 10 18 16
Central 11 11 19 18 9 7 12 13 19 18 11 15
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 8 11 8 9 12 11 15 12 11 13 14 11
South 27 25 15 16 19 18 14 8 9 13 6 2
East 9 13 9 14 14 15 13 11 11 7 12 10
West 14 19 11 19 16 14 15 10 11 18 5 15
Central 12 15 7 11 15 15 13 19 14 10 8 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 24 Feb 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 36 40 45 51 51 47 44 52 54 55 54 54
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 54 55 52 52 52 54 54 53 51 49 45 41



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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