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Pollutant Concentrations

Readings on 13 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 10(6) 27(27) 26(-) 10(4) 0.5(5) 15(54)
South 24(15) 23(23) 4(-) 13(6) 0.5(5) 13(52)
East 8(5) 22(22) 5(-) 40(17) 0.6(6) 16(55)
West 7(4) 31(31) 22(-) 29(12) 0.5(5) 18(57)
Central 5(3) 21(21) 30(-) 20(8) 0.5(5) 11(47)

1-hr PM2.5 (µg/m3)b Readings on 12 Apr 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 27 21 21 22 23 21 18 26 9 10 9 8
South 14 13 11 11 11 12 13 19 17 11 14 15
East 20 18 17 25 21 19 23 34 17 22 17 10
West 34 23 17 19 18 10 29 28 33 34 27 20
Central 15 13 10 12 6 12 12 11 15 14 13 16
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 5 10 15 13 6 16 12 7 10 10 12 20
South 7 8 15 26 6 13 16 14 8 20 6 15
East 10 7 15 11 13 7 16 15 13 11 12 13
West 12 7 26 26 5 2 5 6 5 11 13 14
Central 8 14 7 13 6 3 11 14 9 15 11 12

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 12 Apr 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 61 61 58 56 56 56 56 59 60 60 57 55
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 52 44 46 53 52 46 38 44 45 46 46 52



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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