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Pollutant Concentrations

Readings on 24 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) 210(130) 29(-) 104(44) 2.2(22) 158(208)
South 16(10) 224(137) 20(-) 73(31) 2(20) 198(248)
East 13(8) 188(119) 14(-) 78(33) 1.8(18) 171(222)
West 8(5) 199(125) 7(-) 64(27) 2(20) 174(224)
Central 24(15) 194(123) 36(-) 102(43) 2.1(21) 154(204)

1-hr PM2.5 (µg/m3)b Readings on 24 Sep 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 133 122 133 130 124 113 96 96 97 136 198 227
South 240 187 160 130 144 156 188 199 222 237 264 248
East 254 194 175 154 135 136 154 182 151 226 243 176
West 133 112 81 77 85 103 120 153 160 171 197 235
Central 195 121 106 101 89 88 107 121 176 206 221 198
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 263 201 199 210 238 261 - - - - - -
South 177 143 154 235 300 319 - - - - - -
East 146 119 121 134 168 221 - - - - - -
West 212 194 266 312 304 267 - - - - - -
Central 147 143 137 151 245 267 - - - - - -

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 24 Sep 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 245 233 207 181 170 166 171 183 197 219 244 262
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 260 239 225 232 262 292 - - - - - -



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 24 September 2015

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