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Pollutant Concentrations

Readings on 12 Mar 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 5(3) 20(20) 41(-) 14(6) 0.5(5) 9(39)
South 8(5) 19(19) 9(-) 9(4) 0.4(4) 9(37)
East 5(3) 17(17) 11(-) 12(5) 0.6(6) 11(46)
West 4(2) 22(22) 21(-) 10(4) 0.5(5) 10(42)
Central 5(3) 18(18) 67(-) 15(6) 0.4(4) 9(39)

1-hr PM2.5 (µg/m3)b Readings on 11 Mar 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 11 10 13 15 14 9 10 9 11 18 5 6
South 10 11 8 7 12 3 4 6 13 13 15 12
East 9 13 20 18 9 6 11 5 4 14 10 15
West 17 11 18 14 10 16 3 15 11 13 11 14
Central 16 8 16 8 9 12 11 4 13 11 14 12
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 13 10 7 4 8 4 3 6 11 11 7 11
South 13 5 8 13 4 8 3 10 3 8 11 13
East 18 10 9 10 13 8 6 15 8 13 11 9
West 7 4 8 8 8 7 5 6 6 7 7 13
Central 11 7 5 9 8 10 4 6 6 6 10 7

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 11 Mar 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 40 43 52 52 52 45 38 35 37 45 49 51
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 48 44 38 33 34 35 28 28 27 34 35 40



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.