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Pollutant Concentrations

Readings on 08 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) 22(22) 27(-) 19(8) 0.3(3) 13(52)
South 10(6) 21(21) 5(-) 21(9) 0.4(4) 12(50)
East 11(7) 18(18) 9(-) 34(15) 0.4(4) 12(49)
West 12(7) 32(32) 41(-) 25(11) 0.4(4) 18(58)
Central 7(4) 24(24) 39(-) 23(10) 0.3(3) 14(53)

1-hr PM2.5 (µg/m3)b Readings on 07 Apr 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 18 25 20 14 18 16 12 18 18 13 12 9
South 5 10 7 16 20 13 6 10 10 15 15 14
East 10 10 13 12 16 16 21 18 11 15 12 10
West 21 16 21 17 15 16 25 20 26 22 22 20
Central 20 18 14 17 15 16 21 17 24 13 14 16
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 14 10 12 14 10 12 9 8 10 9 10 7
South 22 20 27 18 11 14 9 7 4 4 6 6
East 14 9 8 14 10 11 13 6 8 6 10 9
West 12 17 20 20 17 17 14 24 14 6 11 17
Central 15 7 23 14 11 15 9 6 4 8 8 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 07 Apr 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 54 54 54 55 55 55 56 56 57 56 56 54
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 54 53 55 55 55 53 51 49 40 34 32 34



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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