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Pollutant Concentrations

Readings on 26 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) 26(26) 12(-) 15(6) 0.5(5) 15(54)
South 46(29) 21(21) 38(-) 16(7) 0.5(5) 12(50)
East 10(6) 22(22) 6(-) 34(14) 0.6(6) 15(54)
West 3(2) 23(23) 27(-) 20(8) 0.5(5) 11(48)
Central 23(14) 23(23) 18(-) 10(4) 0.5(5) 13(52)

1-hr PM2.5 (µg/m3)b Readings on 25 Apr 2015

View reading for:

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

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 25 Apr 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 56 56 56 53 52 53 55 56 59 60 59 55
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 51 41 37 40 44 37 32 32 44 52 53 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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