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Pollutant Concentrations

Readings on 27 Feb 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(3) 21(21) 38(-) 40(17) 0.4(4) 11(47)
South 10(6) 25(25) 7(-) 46(20) 0.3(3) 14(53)
East 12(7) 18(18) 8(-) 49(21) 0.5(5) 12(51)
West 5(3) 29(29) 22(-) 38(16) 0.4(4) 15(55)
Central 8(5) 23(23) 35(-) 46(19) 0.3(3) 13(52)

1-hr PM2.5 (µg/m3)b Readings on 26 Feb 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 10 11 11 8 12 10 9 8 13 13 16 12
South 12 12 8 10 7 7 5 10 16 16 22 34
East 12 9 26 13 11 8 10 10 8 15 10 15
West 16 11 10 16 16 12 14 10 15 22 16 7
Central 12 17 18 10 10 8 5 17 19 12 6 11
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 8 11 12 9 13 12 11 11 13 17 10 11
South 16 19 27 15 8 12 21 8 5 2 8 8
East 11 14 9 9 11 10 14 19 18 12 10 12
West 20 13 17 34 20 10 15 14 16 12 21 14
Central 17 11 12 12 11 11 15 17 11 20 16 11

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 26 Feb 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 53 52 52 52 51 44 40 39 47 53 54 54
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 54 54 54 54 54 52 52 52 53 52 53 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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