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Pollutant Concentrations

Readings on 30 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 3(2) 14(14) 29(-) 19(8) 0.3(3) 7(30)
South 13(8) 16(16) 7(-) 22(9) 0.3(3) 8(35)
East 8(5) 11(11) 13(-) 30(13) 0.4(4) 6(26)
West 25(15) 17(17) 30(-) 15(7) 0.3(3) 9(36)
Central 8(5) 13(13) 24(-) 21(9) 0.3(3) 7(27)

1-hr PM2.5 (µg/m3)b Readings on 29 May 2015

View reading for:

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

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 29 May 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 20 18 18 18 20 21 19 21 26 35 40 43
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 41 43 43 44 44 42 36 30 28 30 27 26



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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