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Pollutant Concentrations

Readings on 13 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) 22(22) 32(-) 36(15) 0.4(4) 12(51)
South 11(7) 27(27) 13(-) 33(14) 0.3(3) 13(52)
East 5(3) 23(23) 7(-) 44(19) 0.5(5) 14(53)
West 4(2) 27(27) 6(-) 50(21) 0.3(3) 14(53)
Central 8(5) 27(27) 52(-) 34(14) 0.3(3) 12(51)

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

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 9 10 11 10 16 11 18 11 16 13 22 17
South 8 15 18 14 9 8 7 17 16 17 19 23
East 12 9 9 6 15 16 17 23 29 19 19 17
West 19 13 13 20 11 9 10 12 14 17 20 16
Central 7 9 10 11 9 9 7 6 18 17 17 14
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 8 12 17 12 17 13 8 10 10 6 9 8
South 10 21 18 24 17 18 6 9 2 4 7 9
East 10 14 15 14 13 15 10 9 13 8 8 7
West 12 17 18 17 19 17 9 12 7 12 6 9
Central 9 17 14 21 19 16 8 13 10 12 13 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 12 Mar 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 43 45 48 50 51 48 48 50 54 56 58 57
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 55 54 53 56 57 56 53 48 38 38 35 35



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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