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Pollutant Concentrations

Readings on 23 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(2) 66(58) 37(-) 21(9) 0.8(8) 47(91)
South 13(8) 71(61) 26(-) 39(17) 0.7(7) 57(103)
East 13(8) 59(55) 13(-) 35(15) 0.6(6) 42(85)
West 52(32) 82(66) 20(-) 33(14) 0.8(8) 66(112)
Central 13(8) 62(56) 36(-) 42(18) 0.6(6) 43(86)

1-hr PM2.5 (µg/m3)b Readings on 22 Sep 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 20 27 34 31 37 34 45 46 40 47 50 68
South 30 35 42 37 42 41 47 50 72 46 48 44
East 25 26 33 42 44 49 44 38 34 40 50 63
West 24 32 36 32 35 37 42 44 33 33 48 65
Central 25 24 27 33 32 34 38 34 53 49 46 54
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 86 81 73 78 91 67 52 29 25 24 23 28
South 75 48 98 179 180 90 25 37 29 28 21 31
East 55 65 73 53 55 54 22 27 28 37 29 29
West 66 87 202 183 140 149 143 57 21 21 21 25
Central 62 53 61 102 124 66 25 18 25 22 15 19

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 22 Sep 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 67 67 71 74 78 80 83 84 87 87 89 94
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 104 111 125 143 161 155 132 103 80 70 65 65



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 22 September 2015

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