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Pollutant Concentrations

Readings on 16 Apr 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) 23(23) 9(-) 25(11) 0.3(3) 12(51)
South 28(17) 21(21) 11(-) 22(9) 0.5(5) 11(45)
East 9(6) 16(16) 7(-) 35(15) 0.5(5) 10(40)
West 5(3) 25(25) 21(-) 34(15) 0.3(3) 13(52)
Central 6(4) 21(21) 26(-) 41(17) 0.3(3) 9(38)

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

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 8 7 9 9 13 14 16 26 15 7 11 7
South 9 6 7 3 7 16 16 6 18 17 14 8
East 9 4 6 7 8 8 11 21 13 11 10 10
West 8 11 12 18 16 18 5 18 12 18 16 16
Central 6 6 7 10 14 16 12 19 18 7 5 6
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 5 6 9 8 15 10 5 12 14 20 26 19
South 9 6 14 17 15 11 21 11 10 6 5 9
East 10 5 9 5 13 12 16 13 5 6 9 7
West 8 6 11 10 18 13 18 12 7 12 10 8
Central 12 7 8 10 9 9 8 6 5 7 6 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 15 Apr 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 41 33 32 34 41 50 52 54 54 54 52 45
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 40 33 35 36 47 48 52 49 45 41 41 44



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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