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Pollutant Concentrations

Readings on 19 May 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) 34(34) 72(-) 9(4) 0.5(5) 20(60)
South 17(10) 23(23) 12(-) 12(5) 0.4(4) 11(47)
East 11(7) 20(20) 24(-) 24(10) 0.6(6) 14(53)
West 19(12) 33(33) 44(-) 20(8) 0.2(2) 20(60)
Central 12(7) 25(25) 29(-) 13(5) 0.4(4) 14(54)

1-hr PM2.5 (µg/m3)b Readings on 18 May 2015

View reading for:

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

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 18 May 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 53 53 55 56 57 56 56 57 58 59 58 56
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 54 53 54 54 56 55 55 55 55 54 54 52



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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