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Pollutant Concentrations

Readings on 23 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 10(6) 35(35) 28(-) 51(22) 0.5(5) 22(62)
South 27(17) 43(43) 22(-) 59(25) 0.5(5) 27(67)
East 6(4) 35(35) 7(-) 81(34) 0.4(4) 26(66)
West 3(2) 41(41) 24(-) 72(31) 0.5(5) 25(66)
Central 9(6) 42(42) 23(-) 70(30) 0.5(5) 24(64)

1-hr PM2.5 (µg/m3)b Readings on 22 Jan 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 14 14 13 17 18 18 19 22 25 20 25 26
South 19 20 17 17 25 24 22 25 26 30 38 31
East 17 18 19 21 21 19 20 20 24 26 31 33
West 24 19 21 24 22 13 9 22 15 28 39 37
Central 16 19 18 17 20 26 22 23 21 25 30 23
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 22 23 21 25 20 24 24 30 30 26 21 27
South 36 39 36 32 31 32 28 26 12 17 28 32
East 28 29 31 34 21 30 31 30 22 30 30 34
West 28 36 28 28 22 27 24 18 33 26 34 23
Central 26 20 26 24 22 28 28 31 24 23 24 33

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 22 Jan 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 57 56 58 58 59 60 60 60 61 64 68 71
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 71 70 69 70 68 68 67 68 67 66 66 68



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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