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Pollutant Concentrations

Readings on 12 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) 36(36) 32(-) 69(29) 0.7(7) 19(59)
South 7(4) 39(39) 14(-) 62(26) 0.5(5) 18(58)
East 10(6) 34(34) 5(-) 88(37) 0.8(8) 25(65)
West 6(3) 40(40) 15(-) 82(35) 0.6(6) 23(63)
Central 9(5) 37(37) 52(-) 92(39) 0.5(5) 19(58)

1-hr PM2.5 (µg/m3)b Readings on 11 Feb 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 17 17 18 18 18 21 20 19 12 6 17 21
South 15 14 17 15 12 8 14 8 11 19 28 28
East 24 23 28 24 22 20 19 12 14 23 16 26
West 12 23 22 24 13 14 14 17 12 8 26 23
Central 11 19 21 15 13 14 11 16 16 14 7 18
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 23 21 20 18 21 30 24 23 23 21 17 14
South 29 26 26 30 27 26 18 12 14 13 17 15
East 29 27 25 27 28 32 31 29 26 25 30 29
West 29 29 27 30 25 25 29 37 32 22 26 27
Central 24 17 17 21 19 27 29 30 27 21 24 17

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 11 Feb 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 52 55 59 60 59 56 55 54 54 53 55 58
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 63 65 65 64 64 66 67 68 66 64 63 61



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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