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Pollutant Concentrations

Readings on 09 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 4(3) 33(33) 34(-) 8(4) 0.6(6) 19(58)
South 20(13) 20(20) 11(-) 8(3) 0.3(3) 12(48)
East 14(9) 16(16) 16(-) 27(11) 0.4(4) 10(44)
West 26(16) 31(31) 22(-) 34(14) 0.7(7) 18(58)
Central 10(6) 20(20) 28(-) 12(5) 0.4(4) 11(47)

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

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 23 19 19 27 33 41 38 35 29 20 15 11
South 13 14 9 15 11 11 8 10 14 6 6 12
East 13 11 14 13 12 8 10 12 8 12 10 9
West 18 21 12 19 18 31 30 33 34 37 26 14
Central 13 8 14 11 10 8 16 15 15 11 10 10
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 16 16 14 10 19 8 10 15 11 8 5 7
South 16 26 21 11 13 10 15 6 10 7 8 7
East 12 17 9 10 12 15 10 8 7 8 6 5
West 16 22 25 21 16 5 9 6 3 6 4 6
Central 12 14 28 10 8 12 12 8 5 5 10 4

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 May 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 55 54 54 54 55 58 59 60 60 59 56 53
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 52 54 57 56 54 50 48 41 38 31 28 27



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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