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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 9(6) 89(70) 33(-) 53(23) 0.6(6) 62(108)
South 13(8) 92(71) 20(-) 48(20) 0.6(6) 72(119)
East 7(5) 71(61) 7(-) 51(21) 0.6(6) 59(105)
West 36(22) 90(70) 19(-) 50(21) 0.5(5) 70(116)
Central 11(7) 83(67) 25(-) 61(26) 0.5(5) 58(103)

1-hr PM2.5 (µg/m3)b Readings on 11 Sep 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 164 159 149 163 154 65 12 8 14 20 42 61
South 216 263 232 200 66 33 24 31 33 30 49 57
East 207 257 243 117 17 14 14 19 23 29 51 55
West 169 166 172 170 148 33 23 35 31 30 48 74
Central 171 198 199 161 33 12 13 19 26 30 44 50
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 81 75 60 51 40 37 39 22 22 22 19 16
South 68 45 55 53 54 50 45 37 27 31 23 15
East 73 42 23 29 27 35 28 32 24 27 22 20
West 90 77 65 65 62 59 45 35 21 28 13 23
Central 70 60 54 34 35 43 23 29 23 20 18 14

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 11 Sep 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 219 234 248 240 198 140 87 64 62 66 75 88
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 106 111 108 97 91 88 84 80 71 67 63 61



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 11 September 2015

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