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Pollutant Concentrations

Readings on 09 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 9(6) 18(18) 29(-) 24(10) 0.3(3) 9(36)
South 11(7) 23(23) 3(-) 24(10) 0.4(4) 12(51)
East 9(5) 14(14) 7(-) 33(14) 0.4(4) 8(35)
West 10(6) 23(23) 20(-) 13(5) 0.3(3) 12(48)
Central 5(3) 18(18) 27(-) 25(11) 0.3(3) 9(37)

1-hr PM2.5 (µg/m3)b Readings on 08 Apr 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 8 17 9 5 4 6 7 11 7 13 12 6
South 12 11 4 3 5 4 7 18 10 17 8 12
East 11 6 7 5 6 6 9 5 13 13 14 7
West 11 18 11 7 6 7 4 11 6 14 18 16
Central 16 12 7 7 4 6 10 9 8 7 13 13
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 6 9 5 6 14 8 9 7 13 9 9 9
South 13 16 16 25 6 17 6 16 19 17 15 14
East 9 7 5 10 7 8 11 10 8 9 8 6
West 9 10 8 9 13 13 26 13 11 11 13 10
Central 6 9 8 12 8 12 6 10 4 7 8 8

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 08 Apr 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 42 47 45 36 26 23 25 33 37 45 48 51
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 45 41 38 43 42 46 46 48 47 46 45 43



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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