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Pollutant Concentrations

Readings on 14 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(5) 25(25) 27(-) 32(14) 0.3(3) 14(53)
South 19(12) 28(28) 3(-) 34(14) 0.4(4) 15(55)
East 8(5) 22(22) 5(-) 51(21) 0.5(5) 15(54)
West 13(8) 34(34) 8(-) 44(19) 0.4(4) 20(60)
Central 5(3) 30(30) 41(-) 39(16) 0.3(3) 16(55)

1-hr PM2.5 (µg/m3)b Readings on 13 Apr 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 12 11 8 10 9 16 28 14 20 18 14 9
South 8 15 17 13 10 17 22 15 14 12 14 20
East 13 15 9 17 16 17 15 16 16 15 16 13
West 27 21 21 14 18 20 19 21 19 21 25 20
Central 17 21 13 15 7 13 19 25 19 8 21 16
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 16 21 17 17 17 11 11 9 10 13 14 13
South 19 14 19 20 11 13 9 20 10 15 19 19
East 15 12 19 16 16 21 10 15 11 10 13 13
West 22 23 16 32 34 28 26 10 10 10 13 10
Central 18 18 20 15 21 12 10 18 6 17 15 22

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 13 Apr 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 53 55 54 54 52 53 56 58 59 56 56 56
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 57 57 58 58 59 58 56 54 51 51 51 54



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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