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Pollutant Concentrations

Readings on 24 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 5(3) 20(20) 41(-) 27(11) 0.4(4) 10(40)
South 7(5) 24(24) 20(-) 23(10) 0.4(4) 11(47)
East 9(5) 20(20) 8(-) 31(13) 0.4(4) 14(53)
West 8(5) 27(27) 22(-) 49(21) 0.4(4) 14(53)
Central 5(3) 20(20) 42(-) 29(12) 0.4(4) 9(39)

1-hr PM2.5 (µg/m3)b Readings on 23 Feb 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 9 5 5 4 6 7 7 10 9 11 7 9
South 6 3 11 9 7 12 2 6 5 7 11 6
East 18 10 27 16 28 28 8 13 13 8 13 12
West 7 8 8 7 5 7 7 11 6 12 20 10
Central 5 8 11 7 7 4 4 9 5 6 3 9
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 13 15 11 19 12 21 8 8 15 5 7 7
South 19 19 25 34 31 16 3 4 7 8 6 13
East 12 11 9 11 15 15 13 18 13 10 9 10
West 19 17 17 31 25 27 26 20 16 16 6 8
Central 13 13 9 20 24 16 7 9 10 10 9 8

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 23 Feb 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 28 30 39 38 44 42 38 37 31 36 38 40
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 48 52 54 57 59 61 57 53 49 47 41 37



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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