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Pollutant Concentrations

Readings on 30 Mar 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 7(5) 25(25) 24(-) 13(5) 0.5(5) 12(50)
South 14(9) 28(28) 3(-) 16(7) 0.5(5) 17(56)
East 5(3) 21(21) 4(-) 25(10) 0.3(3) 13(52)
West 3(2) 29(29) 30(-) 21(9) 0.5(5) 15(54)
Central 5(3) 23(23) 3(-) 31(13) 0.4(4) 11(44)

1-hr PM2.5 (µg/m3)b Readings on 29 Mar 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 7 7 7 14 11 11 10 18 13 10 11 12
South 13 15 11 16 20 14 16 18 22 22 25 17
East 18 19 21 12 15 14 13 15 8 11 21 9
West 17 14 18 18 12 14 16 23 42 49 16 11
Central 7 10 6 7 10 7 10 12 9 17 13 17
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 14 10 11 7 6 25 20 11 11 12 15 14
South 16 3 3 4 29 10 31 23 15 32 14 14
East 8 7 7 10 16 12 12 11 10 10 14 16
West 13 4 2 2 5 16 11 14 7 10 8 11
Central 12 6 3 3 5 11 32 16 13 9 9 8

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 29 Mar 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 53 52 52 52 52 52 52 53 56 59 59 57
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 54 44 33 23 32 45 55 56 55 53 52 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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