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Pollutant Concentrations

Readings on 11 Apr 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) 17(17) 23(-) 30(13) 0.3(3) 10(40)
South 15(9) 17(17) 3(-) 18(8) 0.4(4) 8(35)
East 7(4) 13(13) 7(-) 36(15) 0.5(5) 8(34)
West 4(2) 22(22) 22(-) 43(18) 0.3(3) 10(44)
Central 4(2) 16(16) 35(-) 34(14) 0.3(3) 7(31)

1-hr PM2.5 (µg/m3)b Readings on 10 Apr 2015

View reading for:

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

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 10 Apr 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 51 49 49 46 47 46 44 39 39 41 42 40
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 34 34 33 30 29 28 31 34 32 29 23 26



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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