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Pollutant Concentrations

Readings on 04 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 9(5) 18(18) 29(-) 10(4) 0.5(5) 11(44)
South 35(22) 15(15) 11(-) 11(5) 0.3(3) 8(33)
East 24(15) 13(13) 15(-) 15(6) 0.4(4) 9(36)
West 10(6) 16(16) 25(-) 28(12) 0.3(3) 7(30)
Central 13(8) 20(20) 29(-) 10(4) 0.3(3) 11(44)

1-hr PM2.5 (µg/m3)b Readings on 03 May 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 29 17 5 6 5 2 2 4 13 7 14 13
South 11 12 5 2 2 3 3 7 6 8 9 6
East 16 11 7 6 6 7 5 5 6 6 12 10
West 11 10 3 3 2 3 5 6 4 7 5 6
Central 10 12 9 9 2 3 4 2 6 7 17 51
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 9 7 12 9 13 19 13 12 12 7 13 12
South 10 8 18 16 8 11 8 8 10 7 5 7
East 8 11 22 21 7 8 7 5 6 6 6 7
West 5 5 13 19 15 9 7 3 6 8 4 13
Central 21 5 8 24 12 8 14 9 5 6 5 6

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 03 May 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 55 55 47 33 20 16 14 17 22 26 35 49
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 52 48 45 52 54 52 44 39 35 31 30 31



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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