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Pollutant Concentrations

Readings on 28 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 4(3) 31(31) 44(-) 8(3) 0.7(7) 18(58)
South 37(23) 29(29) 79(-) 14(6) 0.7(7) 18(57)
East 12(8) 30(30) 26(-) 16(7) 0.7(7) 21(61)
West 16(10) 29(29) 51(-) 23(10) 0.6(6) 17(57)
Central 7(4) 27(27) 60(-) 7(3) 0.7(7) 15(54)

1-hr PM2.5 (µg/m3)b Readings on 27 Apr 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 11 12 15 19 18 16 23 20 24 23 16 12
South 10 8 8 7 5 11 8 13 19 24 16 14
East 11 12 20 25 23 18 13 22 21 22 17 15
West 3 4 12 7 5 7 5 9 12 7 15 18
Central 4 10 7 12 10 12 10 15 14 15 12 15
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 13 10 20 9 5 11 14 23 25 26 31 34
South 13 24 13 15 29 18 27 14 34 24 30 33
East 15 28 11 14 19 18 25 40 26 32 27 30
West 16 13 19 16 24 30 38 34 35 38 22 23
Central 9 24 11 12 18 23 21 19 19 20 22 29

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 27 Apr 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 30 33 41 49 52 52 51 53 55 57 57 56
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 54 55 55 55 55 57 62 64 67 68 68 69



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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