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Pollutant Concentrations

Readings on 26 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) 29(29) 69(-) 3(1) 0.6(6) 16(56)
South 11(7) 20(20) 8(-) 5(2) 0.5(5) 12(50)
East 14(8) 16(16) 24(-) 15(6) 0.6(6) 10(41)
West 25(16) 28(28) 36(-) 4(2) 0.3(3) 15(54)
Central 10(6) 19(19) 26(-) 8(4) 0.4(4) 10(42)

1-hr PM2.5 (µg/m3)b Readings on 25 May 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 9 15 18 24 24 22 17 14 9 14 17 13
South 10 8 10 3 5 3 8 14 21 25 15 11
East 10 11 10 10 7 8 8 12 8 8 7 8
West 8 6 12 4 7 16 19 24 26 24 25 16
Central 9 10 7 9 7 8 12 16 10 14 9 10
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 11 14 15 14 14 12 13 16 28 25 17 16
South 13 12 11 12 10 21 12 12 18 16 7 10
East 11 13 11 7 13 13 14 11 8 12 11 7
West 11 14 12 13 10 11 22 17 16 18 11 16
Central 17 13 12 11 10 6 5 11 8 7 11 9

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 25 May 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 34 38 42 43 44 44 47 52 54 55 55 54
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 52 51 52 51 49 49 51 52 53 54 54 52



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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