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Pollutant Concentrations

Readings on 10 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(2) 20(20) 39(-) 22(9) 0.5(5) 9(38)
South 30(19) 19(19) 15(-) 21(9) 0.3(3) 9(39)
East 15(9) 13(13) 13(-) 39(16) 0.5(5) 8(32)
West 25(16) 20(20) 40(-) 46(20) 0.7(7) 9(37)
Central 18(11) 17(17) 25(-) 23(10) 0.4(4) 10(40)

1-hr PM2.5 (µg/m3)b Readings on 09 May 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 7 4 5 5 6 8 8 6 10 4 7 12
South 7 10 2 3 8 4 3 3 2 8 6 23
East 6 8 8 6 5 5 3 3 3 8 8 8
West 6 9 3 6 4 5 7 3 4 9 12 12
Central 7 6 5 6 7 3 5 6 4 10 11 18
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 13 19 18 13 7 11 7 7 7 8 12 14
South 13 12 6 10 7 12 15 14 13 21 17 8
East 9 10 5 5 9 12 14 13 12 10 10 7
West 13 9 8 11 8 11 13 9 15 10 12 14
Central 24 17 13 9 7 12 10 12 9 9 9 10

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 09 May 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 26 28 26 24 22 22 23 20 19 23 30 44
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 52 53 51 46 38 40 43 48 47 47 48 47



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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