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Pollutant Concentrations

Readings on 14 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) 33(33) 34(-) 48(21) 0.6(6) 16(56)
South 10(6) 39(39) 13(-) 39(17) 0.4(4) 20(60)
East 9(5) 50(50) 11(-) 57(24) 0.7(7) 40(83)
West 4(2) 39(39) 7(-) 57(24) 0.5(5) 23(64)
Central 9(5) 37(37) 34(-) 54(23) 0.4(4) 19(59)

1-hr PM2.5 (µg/m3)b Readings on 13 Feb 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 17 8 6 15 17 13 16 18 17 16 21 21
South 13 22 17 18 12 15 20 19 27 26 26 34
East 97 76 155 24 8 12 17 51 45 22 22 24
West 18 23 13 21 20 21 20 28 20 26 38 34
Central 17 21 21 15 15 17 16 23 24 14 13 28
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 20 20 21 22 17 16 19 19 19 14 8 10
South 27 26 28 26 22 16 19 10 13 8 15 13
East 22 22 28 23 27 29 46 29 35 19 54 81
West 30 24 25 24 21 18 24 28 18 25 17 21
Central 20 20 20 21 23 16 24 25 17 16 13 15

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 13 Feb 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 63 68 77 72 66 56 55 60 65 66 64 65
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 66 65 64 64 64 62 63 63 63 60 59 62



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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