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Pollutant Concentrations

Readings on 12 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) 24(24) 32(-) 14(6) 0.4(4) 13(52)
South 18(11) 22(22) 5(-) 11(5) 0.5(5) 12(50)
East 10(6) 21(21) 9(-) 24(10) 0.6(6) 13(53)
West 4(2) 28(28) 19(-) 23(10) 0.6(6) 16(55)
Central 5(3) 22(22) 47(-) 18(8) 0.5(5) 12(48)

1-hr PM2.5 (µg/m3)b Readings on 11 Apr 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 6 8 5 6 9 10 14 13 14 14 17 17
South 7 5 4 6 5 4 11 20 8 17 10 20
East 4 6 7 7 9 10 15 12 17 15 15 12
West 2 7 8 11 14 19 21 17 9 21 19 19
Central 7 7 5 5 7 11 15 14 11 5 17 11
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 12 19 7 7 11 16 8 12 16 21 22 30
South 13 22 17 6 10 11 20 15 14 13 14 13
East 15 11 19 8 18 18 8 13 15 14 24 27
West 20 11 9 9 15 13 18 21 20 21 24 26
Central 27 16 13 4 11 14 13 10 11 12 13 15

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 11 Apr 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 25 27 25 27 30 37 48 53 53 53 53 55
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 56 56 55 49 46 48 53 53 54 55 57 59



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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