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Pollutant Concentrations

Readings on 08 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 5(3) 69(60) 48(-) 40(17) 0.9(9) 49(93)
South 12(8) 56(53) 29(-) 38(16) 0.8(8) 42(85)
East 15(9) 58(54) 14(-) 40(17) 0.8(8) 40(82)
West 41(25) 64(57) 34(-) 47(20) 0.7(7) 48(92)
Central 10(7) 53(52) 36(-) 50(21) 0.8(8) 38(81)

1-hr PM2.5 (µg/m3)b Readings on 07 Sep 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 34 29 22 24 20 29 32 29 33 33 29 35
South 29 28 22 18 17 16 23 24 22 18 23 31
East 29 17 14 16 25 19 23 17 17 12 19 38
West 29 25 18 21 22 19 39 38 26 25 40 43
Central 30 25 18 17 20 15 18 17 18 14 24 28
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 50 57 70 97 99 98 77 65 71 53 56 42
South 44 48 58 65 66 79 74 87 74 66 53 36
East 36 63 67 64 56 57 63 96 67 42 34 40
West 50 52 66 84 83 93 61 80 90 65 50 43
Central 46 52 60 64 67 72 57 65 63 49 46 35

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 07 Sep 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 74 70 65 61 59 60 63 64 66 63 64 68
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 78 88 99 110 117 123 120 121 119 115 104 91



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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Last Updated on 07 September 2015

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