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Pollutant Concentrations

Readings on 29 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) 24(24) 37(-) 22(9) 0.4(4) 13(52)
South 18(11) 26(26) 50(-) 8(3) 0.5(5) 12(49)
East 6(4) 20(20) 11(-) 29(12) 0.6(6) 12(51)
West 9(5) 29(29) 26(-) 41(17) 0.4(4) 18(58)
Central 18(11) 24(24) 59(-) 26(11) 0.3(3) 12(50)

1-hr PM2.5 (µg/m3)b Readings on 28 Jan 2015

View reading for:

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

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 28 Jan 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 49 48 51 46 48 46 51 52 52 52 53 55
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 56 56 53 52 53 54 58 58 57 53 42 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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