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Pollutant Concentrations

Readings on 11 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 11(7) 127(88) 113(-) 35(15) 1.9(19) 99(146)
South 19(12) 123(87) 67(-) 28(12) 1.8(18) 105(152)
East 14(9) 113(82) 26(-) 40(17) 1.5(15) 100(147)
West 10(6) 114(82) 19(-) 34(14) 1.6(16) 96(144)
Central 16(10) 110(80) 53(-) 36(15) 1.8(18) 88(135)

1-hr PM2.5 (µg/m3)b Readings on 10 Sep 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 61 70 71 70 70 61 63 61 94 103 86 78
South 57 62 58 68 59 64 69 78 91 99 106 89
East 54 62 60 64 66 64 64 68 74 82 98 102
West 49 53 53 55 58 62 58 78 82 70 85 93
Central 47 46 46 54 52 52 60 71 68 72 90 94
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 85 82 95 88 112 118 134 143 144 152 165 164
South 90 85 88 118 114 149 158 161 160 177 159 158
East 93 83 87 102 106 131 149 154 158 162 160 156
West 82 83 92 109 109 123 133 131 130 167 186 174
Central 79 76 85 88 97 120 130 131 135 150 150 129

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 10 Sep 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 96 99 102 105 106 107 107 111 118 126 133 137
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 137 133 132 138 147 160 174 187 193 200 207 211



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 10 September 2015

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