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Pollutant Concentrations

Readings on 16 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 4(3) 88(69) 60(-) 9(4) 1.4(14) 64(110)
South 13(8) 89(70) 30(-) 12(5) 1.3(13) 74(121)
East 10(7) 75(63) 15(-) 20(9) 1.6(16) 62(108)
West 25(15) 95(73) 23(-) 10(4) 1.2(12) 80(126)
Central 10(6) 82(66) 59(-) 7(3) 1.3(13) 63(109)

1-hr PM2.5 (µg/m3)b Readings on 15 Sep 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 68 56 48 55 55 66 65 56 47 43 45 59
South 65 60 59 48 63 63 68 75 77 69 74 101
East 42 40 41 52 50 55 79 68 80 76 60 80
West 93 73 51 55 88 89 77 67 62 36 56 76
Central 60 53 42 53 60 65 63 65 56 42 57 81
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 81 99 94 73 70 72 66 63 - - - 61
South 132 103 85 93 73 61 69 69 - - - 79
East 65 72 72 57 66 72 65 55 - - - 53
West 125 161 101 101 105 84 74 66 - - - 66
Central 105 86 85 65 65 66 60 49 - - - 67

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 15 Sep 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 126 114 102 97 99 107 113 114 113 107 104 110
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 126 142 145 137 127 121 117 112 - - - 109



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 15 September 2015

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