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Pollutant Concentrations

Readings on 25 Apr 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) 29(29) 42(-) 6(3) 0.7(7) 17(57)
South 46(29) 22(22) 53(-) 13(6) 0.5(5) 14(54)
East 11(7) 25(25) 29(-) 15(6) 0.9(9) 18(58)
West 5(3) 21(21) 15(-) 30(13) 0.4(4) 11(46)
Central 22(14) 30(30) 59(-) 11(5) 0.6(6) 17(57)

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

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 33 38 27 20 25 18 17 13 15 19 16 16
South 17 18 20 10 16 7 17 13 20 20 21 7
East 25 16 23 22 22 21 21 15 20 14 21 18
West 10 9 9 13 11 10 13 17 16 18 22 16
Central 19 20 21 14 19 18 22 20 18 20 18 15
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 16 9 7 18 9 9 5 9 20 20 16 21
South 6 11 18 36 16 5 6 18 10 5 14 12
East 6 8 15 39 17 9 11 14 15 18 28 20
West 7 14 8 7 25 3 3 4 5 10 5 8
Central 9 8 7 35 35 3 11 13 22 18 18 10

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 Apr 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 64 61 60 59 58 56 57 56 57 57 58 57
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 54 47 42 55 59 57 46 34 46 52 54 54



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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