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Pollutant Concentrations

Readings on 12 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) 21(21) 34(-) 15(6) 0.6(6) 12(48)
South 15(9) 15(15) 10(-) 7(3) 0.4(4) 9(38)
East 14(9) 15(15) 25(-) 12(5) 1(10) 9(37)
West 26(16) 23(23) 56(-) 15(6) 0.5(5) 12(51)
Central 9(6) 15(15) 51(-) 10(4) 0.5(5) 8(32)

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

View reading for:

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

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 11 Jun 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 27 34 33 30 25 22 22 27 37 48 50 44
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 39 34 35 39 44 50 47 50 52 53 53 52



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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