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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 7(4) 107(79) 36(-) 63(27) 1.6(16) 82(129)
South 27(17) 110(80) 35(-) 48(21) 1.6(16) 88(135)
East 14(9) 89(70) 28(-) 47(20) 1.8(18) 80(126)
West 14(9) 119(85) 9(-) 72(31) 1.5(15) 98(145)
Central 25(16) 96(73) 31(-) 66(28) 1.8(18) 75(121)

1-hr PM2.5 (µg/m3)b Readings on 23 Sep 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 20 20 26 30 31 34 42 58 61 76 76 108
South 27 33 29 28 30 28 35 26 33 54 66 123
East 26 26 26 28 31 25 26 19 27 28 32 78
West 24 22 26 33 36 45 52 60 52 60 84 138
Central 28 22 24 22 25 24 29 30 35 43 61 94
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 95 95 88 89 96 109 103 113 115 144 171 172
South 103 107 71 76 101 107 125 126 159 182 195 252
East 124 81 75 76 75 86 147 161 140 199 185 191
West 134 122 128 138 113 94 106 123 152 176 208 224
Central 108 81 69 64 69 90 118 114 139 126 163 216

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 23 Sep 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 65 66 66 67 69 71 74 77 81 87 97 121
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 142 154 146 138 135 139 150 163 178 194 214 237



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 23 September 2015

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