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Pollutant Concentrations

Readings on 16 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 6(4) 18(18) 40(-) 31(13) 0.4(4) 10(42)
South 28(17) 20(20) 12(-) 29(12) 0.4(4) 8(35)
East 6(4) 17(17) 6(-) 47(20) 0.5(5) 10(42)
West 4(2) 21(21) 20(-) 22(9) 0.4(4) 10(41)
Central 26(16) 19(19) 18(-) 40(17) 0.3(3) 8(35)

1-hr PM2.5 (µg/m3)b Readings on 15 Mar 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 12 10 16 10 7 11 9 14 10 9 9 6
South 8 14 6 8 6 5 7 8 11 9 17 6
East 10 15 14 12 10 12 11 12 9 11 10 8
West 10 10 12 6 6 7 11 8 11 5 14 14
Central 7 10 6 7 8 6 10 10 11 5 10 14
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 5 11 14 18 4 10 13 8 7 7 10 10
South 9 12 13 17 12 12 4 4 2 3 3 5
East 12 6 12 10 7 10 7 12 5 8 8 10
West 11 10 15 15 16 10 4 2 11 6 13 12
Central 4 7 7 19 7 8 8 6 6 11 10 6

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 15 Mar 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 32 39 44 43 37 34 35 39 42 40 42 41
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 41 37 41 51 52 49 37 33 27 27 30 33



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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