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Pollutant Concentrations

Readings on 17 May 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 5(3) 21(21) 51(-) 5(2) 0.4(4) 10(42)
South 17(11) 12(12) 13(-) 11(4) 0.3(3) 6(23)
East 12(7) 10(10) 22(-) 18(8) 0.7(7) 6(26)
West 30(19) 21(21) 31(-) 19(8) 0.4(4) 11(47)
Central 7(4) 15(15) 23(-) 12(5) 0.4(4) 7(31)

1-hr PM2.5 (µg/m3)b Readings on 16 May 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 10 11 9 8 9 8 15 10 20 19 16 9
South 5 7 2 4 2 8 3 9 5 1 2 3
East 6 5 5 4 5 5 4 10 8 6 5 6
West 6 14 7 5 4 8 15 12 14 35 28 14
Central 6 7 6 6 11 10 6 15 17 4 6 5
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 12 7 10 7 9 6 8 9 6 8 13 4
South 8 6 8 8 7 6 3 3 12 7 7 4
East 10 13 3 7 5 6 9 6 5 7 5 5
West 11 7 5 7 10 18 9 8 8 6 9 9
Central 18 7 5 3 3 6 6 5 6 5 8 6

Note:
a Sub-index for nitrogen dioxide is reported only when the 1-hr concentration equals or exceeds 1130 µg/m3.

b There is no sub-index for 1-hr PM2.5.

3-hr PSI Readings from 1am to 12am on 16 May 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 36 34 30 28 25 27 31 38 45 51 51 44
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 42 38 36 28 27 30 31 30 28 28 31 29



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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