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Pollutant Concentrations

Readings on 17 Feb 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 5(3) 28(28) 44(-) 42(18) 0.4(4) 15(55)
South 9(6) 36(36) 17(-) 43(18) 0.4(4) 23(64)
East 6(4) 28(28) 11(-) 54(23) 0.6(6) 20(60)
West 4(3) 33(33) 7(-) 50(21) 0.5(5) 19(59)
Central 9(6) 29(29) 49(-) 55(23) 0.4(4) 16(55)

1-hr PM2.5 (µg/m3)b Readings on 16 Feb 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 11 13 10 8 12 11 16 12 15 20 20 22
South 25 14 13 11 14 12 18 26 20 22 42 45
East 8 11 13 11 15 12 32 64 23 27 32 32
West 7 15 16 12 15 16 13 13 18 14 25 32
Central 10 5 10 7 8 13 21 17 22 14 22 22
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 26 21 26 16 13 14 14 17 17 14 12 11
South 39 43 25 38 24 25 20 19 6 2 11 4
East 18 23 19 22 15 18 21 20 15 11 11 14
West 25 29 30 22 22 22 24 25 15 18 13 15
Central 29 21 18 17 15 16 24 19 14 14 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 16 Feb 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 50 48 51 47 49 49 54 60 62 62 63 67
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 70 69 67 65 62 60 59 60 58 54 54 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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