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Pollutant Concentrations

Readings on 09 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 4(2) 77(64) 36(-) 39(16) 0.8(8) 57(103)
South 8(5) 65(58) 19(-) 39(16) 0.7(7) 51(95)
East 13(8) 69(60) 18(-) 35(15) 0.7(7) 47(91)
West 37(23) 74(62) 4(-) 43(18) 0.6(6) 55(100)
Central 7(4) 63(57) 27(-) 49(21) 0.7(7) 45(88)

1-hr PM2.5 (µg/m3)b Readings on 08 Sep 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 36 38 45 47 46 43 32 38 39 45 61 62
South 37 43 40 44 36 34 34 29 39 44 48 55
East 41 39 34 31 27 20 25 35 32 44 42 41
West 41 38 39 45 41 39 27 41 40 52 55 63
Central 34 31 37 38 36 29 28 27 31 39 40 46
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 64 84 90 96 106 90 70 72 62 49 35 18
South 57 70 77 82 91 77 68 60 49 45 38 26
East 49 64 80 62 85 111 94 58 43 37 26 16
West 77 92 80 100 93 86 60 57 58 42 36 29
Central 61 72 71 80 88 65 60 55 38 35 26 20

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 08 Sep 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 84 81 80 82 81 79 75 74 75 81 86 93
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 99 110 119 127 132 134 130 118 106 95 84 73



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 08 September 2015

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