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Pollutant Concentrations

Readings on 17 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 8(5) 19(19) 10(-) 24(10) 0.3(3) 12(50)
South 31(19) 18(18) 21(-) 18(7) 0.3(3) 9(39)
East 9(5) 15(15) 7(-) 42(18) 0.5(5) 9(37)
West 3(2) 23(23) 20(-) 47(20) 0.3(3) 12(49)
Central 5(3) 18(18) 34(-) 42(18) 0.3(3) 8(32)

1-hr PM2.5 (µg/m3)b Readings on 16 Apr 2015

View reading for:

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

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 16 Apr 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 42 40 38 38 35 33 30 32 37 45 47 47
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 46 45 45 45 46 47 44 45 41 40 38 43



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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