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Pollutant Concentrations

Readings on 13 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) 37(37) 27(-) 52(22) 0.6(6) 19(59)
South 8(5) 38(38) 12(-) 44(19) 0.5(5) 19(59)
East 10(6) 36(36) 3(-) 67(28) 0.8(8) 27(68)
West 3(2) 40(40) 9(-) 57(24) 0.5(5) 22(63)
Central 8(5) 35(35) 28(-) 58(25) 0.4(4) 18(58)

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

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 17 14 20 19 19 23 21 21 16 26 32 12
South 21 17 17 19 21 17 16 22 21 25 27 27
East 33 30 33 26 26 26 24 27 24 24 21 24
West 31 35 18 29 28 22 16 22 13 20 21 21
Central 22 17 19 23 24 19 17 22 19 14 13 16
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 13 22 23 21 17 17 14 14 16 16 15 23
South 17 29 29 30 28 24 10 8 5 3 7 15
East 19 24 22 22 26 27 35 27 44 30 14 31
West 23 24 22 25 28 23 26 17 16 15 22 20
Central 17 21 22 15 22 25 20 16 16 12 14 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 12 Feb 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 63 63 63 63 63 63 61 61 60 61 61 62
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 60 61 62 64 64 64 63 60 59 57 56 56



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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