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Pollutant Concentrations

Readings on 26 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 6(4) 28(28) 21(-) 28(12) 0.3(3) 16(55)
South 10(6) 24(24) 14(-) 30(13) 0.3(3) 12(51)
East 6(4) 19(19) 3(-) 35(15) 0.4(4) 12(48)
West 4(3) 27(27) 7(-) 13(6) 0.4(4) 14(53)
Central 8(5) 25(25) 25(-) 35(15) 0.3(3) 12(51)

1-hr PM2.5 (µg/m3)b Readings on 25 Mar 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 33 30 29 26 25 26 20 19 17 7 8 10
South 8 11 7 11 15 19 11 7 10 18 13 14
East 11 13 11 12 15 9 10 11 7 11 17 14
West 17 12 15 13 13 10 10 16 12 18 19 12
Central 18 17 12 9 21 18 17 12 9 6 5 12
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 11 11 16 20 12 9 9 11 5 10 10 7
South 17 14 22 24 10 10 10 8 2 3 2 6
East 13 15 14 15 12 11 11 11 6 12 6 12
West 15 15 17 18 19 13 13 13 10 13 11 10
Central 10 11 14 13 14 16 11 13 10 13 9 9

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 25 Mar 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 54 55 56 54 55 55 55 53 51 51 49 51
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 52 52 54 55 55 54 50 47 40 39 33 40



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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