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Pollutant Concentrations

Readings on 30 Jan 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) 16(16) 30(-) 13(6) 0.4(4) 7(31)
South 17(11) 23(23) 35(-) 14(6) 0.4(4) 11(44)
East 6(4) 16(16) 9(-) 26(11) 0.6(6) 10(43)
West 5(3) 23(23) 18(-) 23(10) 0.4(4) 12(51)
Central 19(12) 18(18) 45(-) 21(9) 0.4(4) 8(34)

1-hr PM2.5 (µg/m3)b Readings on 29 Jan 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 8 7 8 7 7 7 10 7 12 9 11 9
South 5 8 11 4 9 9 10 10 14 12 17 19
East 10 11 13 9 13 11 14 11 17 7 11 11
West 10 8 8 10 13 12 7 13 15 11 16 14
Central 9 10 10 8 11 9 7 11 12 7 16 6
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 8 10 9 7 5 4 5 7 4 8 5 4
South 16 23 22 17 12 11 10 6 2 1 3 3
East 11 14 10 13 12 8 17 5 4 5 7 5
West 16 14 10 15 22 25 10 4 12 10 9 7
Central 9 5 10 10 6 6 9 14 3 4 3 3

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 29 Jan 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 35 37 38 37 39 39 42 41 47 47 51 49
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 52 51 51 51 50 47 45 39 31 25 22 21



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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