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Pollutant Concentrations

Readings on 25 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 9(6) 30(30) 29(-) 41(17) 0.4(4) 17(56)
South 22(13) 34(34) 23(-) 51(22) 0.4(4) 19(59)
East 5(3) 30(30) 9(-) 71(30) 0.6(6) 21(61)
West 3(2) 39(39) 19(-) 64(27) 0.5(5) 22(62)
Central 11(7) 39(39) 23(-) 63(27) 0.4(4) 19(59)

1-hr PM2.5 (µg/m3)b Readings on 24 Jan 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 14 17 11 14 13 12 16 17 14 13 13 22
South 12 12 11 12 21 12 15 14 14 21 17 25
East 15 17 19 15 14 16 17 16 13 18 16 19
West 18 12 17 14 15 18 10 23 18 23 29 22
Central 13 8 16 18 21 18 15 14 15 14 16 19
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 25 17 18 10 17 20 22 19 20 20 23 19
South 25 21 40 26 16 22 19 15 14 22 26 30
East 22 24 24 26 22 29 29 22 22 31 27 29
West 22 24 26 33 24 22 17 23 23 27 32 26
Central 25 15 21 27 18 31 22 20 23 26 25 27

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 24 Jan 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 53 52 53 53 55 55 55 55 55 56 56 59
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 61 62 64 64 64 63 62 62 61 62 65 67



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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