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Pollutant Concentrations

Readings on 26 Jan 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 8(5) 42(42) 28(-) 54(23) 0.5(5) 27(68)
South 8(5) 55(53) 15(-) 69(29) 0.4(4) 35(77)
East 5(3) 41(41) 7(-) 83(35) 0.6(6) 32(73)
West 3(2) 48(48) 19(-) 76(32) 0.5(5) 31(72)
Central 11(7) 47(47) 12(-) 88(37) 0.4(4) 29(70)

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

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 25 28 16 23 28 23 31 33 30 29 28 25
South 31 35 25 39 31 39 38 29 36 47 47 52
East 26 28 28 27 33 34 33 30 38 35 36 40
West 28 32 27 31 34 31 27 33 40 33 37 38
Central 24 23 31 30 32 36 35 26 30 29 31 35
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 28 30 21 27 29 26 24 32 30 27 27 23
South 52 47 56 48 32 36 24 15 19 18 16 22
East 36 29 35 31 33 35 34 35 27 29 25 23
West 37 38 28 34 34 31 22 34 30 25 28 9
Central 41 25 34 22 26 28 28 28 25 27 23 18

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 Jan 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 67 68 68 69 70 73 74 73 74 75 77 78
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 80 79 78 75 74 73 71 70 68 68 66 63



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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