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Pollutant Concentrations

Readings on 10 Sep 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 3(2) 55(53) 56(-) 5(2) 1.5(15) 37(79)
South 24(15) 49(49) 54(-) 10(4) 1.2(12) 36(78)
East 19(12) 50(50) 38(-) 6(2) 1.2(12) 35(77)
West 14(9) 50(50) 14(-) 19(8) 1(10) 36(78)
Central 14(9) 47(47) 63(-) 10(4) 1.3(13) 31(73)

1-hr PM2.5 (µg/m3)b Readings on 09 Sep 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 12 13 20 21 21 22 22 23 29 28 30 40
South 25 23 18 22 21 18 20 12 22 24 24 30
East 19 12 13 17 22 17 23 15 19 17 19 29
West 23 25 19 21 21 30 24 22 24 24 31 41
Central 17 20 14 16 12 15 15 14 19 17 24 29
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 51 70 46 36 21 42 56 60 54 54 64 56
South 44 60 51 53 51 46 48 54 59 55 39 53
East 44 60 63 64 40 45 43 49 49 57 52 54
West 61 66 29 31 42 49 46 48 44 50 48 46
Central 38 53 43 39 42 34 47 47 51 48 46 55

Note:
a Sub-index for nitrogen dioxide is reported only when the 1-hour concentration exceeds 1130 µg/m3.
b There is no sub-index for 1-h PM2.5.

3-hr PSI Readings from 1am to 12am on 09 Sep 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 65 60 58 58 58 60 60 59 60 61 64 68
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 78 91 96 95 86 85 87 91 94 96 95 96



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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