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Pollutant Concentrations

Readings on 29 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 6(3) 24(24) 52(-) 14(6) 0.6(6) 15(54)
South 9(5) 29(29) 51(-) 26(11) 0.4(4) 15(54)
East 11(7) 25(25) 23(-) 14(6) 0.5(5) 18(58)
West 8(5) 28(28) 37(-) 37(16) 0.4(4) 16(55)
Central 6(4) 28(28) 41(-) 12(5) 0.5(5) 17(56)

1-hr PM2.5 (µg/m3)b Readings on 28 Apr 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 30 27 26 18 27 17 18 17 20 13 20 19
South 40 37 22 13 10 12 18 15 12 23 16 13
East 34 29 26 18 19 25 25 26 24 26 18 18
West 24 21 12 20 20 15 21 19 15 21 14 23
Central 30 24 21 17 20 15 17 14 18 13 13 15
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 17 11 10 8 6 8 11 5 3 4 6 17
South 14 11 18 11 16 11 5 10 5 4 9 16
East 12 17 14 18 12 15 19 10 5 6 9 12
West 17 13 26 37 24 6 5 4 3 11 5 4
Central 13 10 16 19 19 10 7 37 24 6 6 16

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 28 Apr 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 70 71 68 62 59 57 58 58 58 58 57 57
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 56 54 54 55 57 54 48 45 42 38 29 36



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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