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Pollutant Concentrations

Readings on 18 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) 19(19) 33(-) 9(4) 0.4(4) 8(31)
South 12(8) 14(14) 18(-) 11(5) 0.4(4) 7(28)
East 13(8) 14(14) 25(-) 22(9) 0.7(7) 9(36)
West 23(14) 20(20) 45(-) 22(9) 0.3(3) 9(39)
Central 10(6) 15(15) 27(-) 11(5) 0.5(5) 8(33)

1-hr PM2.5 (µg/m3)b Readings on 17 May 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 7 5 5 5 8 6 5 11 11 10 8 11
South 2 5 3 5 6 5 4 11 2 5 10 5
East 4 7 4 4 5 7 5 9 6 16 6 4
West 11 10 4 4 8 3 4 5 7 20 20 18
Central 5 8 4 4 4 8 8 9 7 5 6 4
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 3 7 7 8 5 6 9 4 9 10 10 9
South 8 4 2 9 8 8 12 11 5 12 10 10
East 7 5 5 12 9 10 8 6 23 17 16 14
West 4 7 7 5 9 5 3 12 12 15 15 15
Central 9 11 6 5 7 9 7 6 8 19 21 13

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 17 May 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 27 26 23 22 21 23 24 28 29 38 39 41
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 34 30 25 28 29 32 32 32 38 47 53 53



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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