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Pollutant Concentrations

Readings on 20 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 8(5) 105(78) 19(-) 46(20) 0.9(9) 78(124)
South 8(5) 109(80) 23(-) 51(22) 0.9(9) 92(139)
East 16(10) 93(72) 16(-) 46(20) 0.7(7) 84(131)
West 6(4) 107(79) 11(-) 49(21) 0.8(8) 87(133)
Central 5(3) 94(72) 32(-) 57(24) 0.9(9) 68(114)

1-hr PM2.5 (µg/m3)b Readings on 19 Sep 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 107 120 124 132 129 125 111 116 116 110 82 51
South 131 146 137 130 138 135 131 120 119 86 99 92
East 128 133 130 130 119 112 117 114 113 90 87 83
West 83 103 119 148 139 131 129 130 121 113 104 89
Central 89 105 96 98 93 85 100 85 96 80 73 75
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 51 55 55 53 48 42 39 40 39 42 41 38
South 83 88 72 71 70 57 39 56 52 57 49 41
East 75 79 61 59 50 40 52 54 54 52 47 39
West 79 74 71 66 57 50 46 41 42 52 47 44
Central 76 61 60 51 45 33 42 48 36 43 40 29

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 19 Sep 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 142 154 165 172 173 171 168 164 163 155 147 134
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 126 120 115 111 105 97 91 89 89 91 90 87



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 19 September 2015

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