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Pollutant Concentrations

Readings on 12 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) 78(65) 35(-) 46(20) 1.1(11) 57(102)
South 14(8) 74(63) 25(-) 45(19) 0.9(9) 55(99)
East 8(5) 65(58) 9(-) 52(22) 1(10) 53(97)
West 30(19) 82(66) 18(-) 52(22) 1(10) 62(107)
Central 10(6) 67(59) 27(-) 61(26) 0.8(8) 47(90)

1-hr PM2.5 (µg/m3)b Readings on 12 Sep 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 18 21 18 19 18 22 22 31 37 35 45 64
South 18 20 21 24 17 28 31 45 47 43 36 52
East 18 19 19 20 21 24 27 36 40 49 50 59
West 15 24 19 25 22 27 32 44 50 47 55 65
Central 22 15 14 14 17 21 28 33 47 36 43 45
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 88 117 115 105 108 78 63 99 95 68 59 -
South 75 91 97 76 83 83 99 123 66 51 71 -
East 71 96 114 95 91 69 70 100 62 46 59 -
West 95 111 108 110 84 93 118 139 72 52 51 -
Central 71 93 87 83 83 51 58 94 55 47 49 -

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 12 Sep 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 58 58 58 59 59 61 64 71 79 84 87 92
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 107 126 142 147 143 133 129 136 134 124 106 -



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 12 September 2015

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