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Pollutant Concentrations

Readings on 28 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 6(4) 25(25) 29(-) 31(13) 0.4(4) 13(52)
South 8(5) 35(35) 24(-) 28(12) 0.5(5) 17(57)
East 6(4) 25(25) 5(-) 42(18) 0.6(6) 18(57)
West 4(2) 32(32) 11(-) 36(15) 0.4(4) 19(59)
Central 11(7) 32(32) 23(-) 42(18) 0.4(4) 17(57)

1-hr PM2.5 (µg/m3)b Readings on 27 Jan 2015

View reading for:

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

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 27 Jan 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 57 58 57 57 57 59 58 58 57 57 58 58
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 60 58 58 56 56 56 56 55 55 55 53 51



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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