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Pollutant Concentrations

Readings on 16 Jun 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) 28(28) 46(-) 19(8) 0.6(6) 16(55)
South 20(12) 25(25) 14(-) 13(5) 0.4(4) 16(55)
East 12(8) 19(19) 29(-) 23(10) 0.8(8) 14(53)
West 20(13) 27(27) 36(-) 26(11) 0.5(5) 16(55)
Central 8(5) 23(23) 57(-) 14(6) 0.3(3) 12(51)

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

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 6 4 13 8 12 16 10 17 13 24 15 11
South 4 5 6 4 5 8 4 13 9 12 20 15
East 6 5 6 5 7 4 7 11 11 17 11 15
West 3 11 4 10 5 6 10 9 14 20 19 18
Central 9 6 6 3 6 9 12 16 9 18 15 23
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 20 26 14 13 22 15 13 20 21 25 23 16
South 22 20 25 24 23 23 27 23 20 18 22 20
East 14 22 7 18 17 26 16 19 21 19 23 20
West 21 17 18 21 21 22 19 22 22 21 26 28
Central 20 22 13 13 17 7 7 11 9 12 15 12

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 15 Jun 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 23 24 26 26 28 30 34 43 46 53 54 56
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 57 59 59 58 57 59 58 58 58 59 60 60



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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