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Pollutant Concentrations

Readings on 05 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) 52(-) 11(4) 0.7(7) 22(62)
South 31(19) 28(28) 60(-) 6(3) 0.8(8) 19(58)
East 16(10) 25(25) 29(-) 11(5) 0.8(8) 18(58)
West 18(11) 34(34) 57(-) 15(7) 0.8(8) 18(58)
Central 7(5) 27(27) 78(-) 7(3) 0.7(7) 15(55)

1-hr PM2.5 (µg/m3)b Readings on 04 May 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 7 16 18 15 18 23 26 28 27 26 22 15
South 6 6 7 6 7 7 10 12 12 18 10 7
East 7 7 11 11 12 12 16 15 18 8 15 13
West 9 6 11 9 12 9 9 11 13 25 19 22
Central 7 10 9 12 12 12 11 11 19 10 7 13
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 17 18 23 18 13 17 9 22 27 34 46 38
South 14 13 7 22 19 22 24 31 30 47 44 44
East 19 26 13 12 18 7 23 30 22 34 39 50
West 22 15 14 18 17 17 29 22 29 32 27 30
Central 24 17 16 28 19 13 11 22 29 22 18 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 04 May 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 31 35 38 43 47 49 52 53 55 56 56 55
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 55 56 57 57 57 57 57 60 65 70 74 77



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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