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Pollutant Concentrations

Readings on 14 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 9(6) 133(92) 49(-) 46(20) 1.5(15) 97(144)
South 9(6) 137(93) 29(-) 39(17) 1.4(14) 115(163)
East 9(6) 120(85) 15(-) 48(20) 1.5(15) 106(154)
West 42(26) 137(94) 18(-) 49(21) 1.2(12) 113(161)
Central 7(4) 126(88) 31(-) 60(25) 1.3(13) 91(138)

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

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 58 78 78 85 108 111 114 112 100 108 85 90
South 71 79 100 117 125 118 124 134 116 99 101 101
East 69 79 84 100 117 118 126 121 112 109 99 103
West 54 72 97 112 116 120 122 136 127 122 112 108
Central 57 64 77 78 96 98 102 102 98 84 92 89
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 92 109 111 100 90 81 89 85 71 83 133 154
South 114 111 103 90 91 96 97 74 122 184 190 196
East 97 106 104 94 82 86 78 72 91 147 175 178
West 110 105 87 89 97 87 80 69 110 178 198 205
Central 91 104 91 79 81 79 71 56 71 140 144 141

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 13 Sep 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 102 108 121 134 147 156 162 165 165 160 152 148
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 146 150 150 146 140 135 133 127 129 151 185 214



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 13 September 2015

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