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Pollutant Concentrations

Readings on 20 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 4(2) 21(21) 34(-) 18(7) 0.4(4) 11(48)
South 11(7) 21(21) 8(-) 15(6) 0.3(3) 11(48)
East 14(9) 17(17) 18(-) 20(8) 0.7(7) 11(46)
West 42(26) 23(23) 26(-) 21(9) 0.5(5) 13(52)
Central 8(5) 19(19) 41(-) 17(7) 0.4(4) 9(39)

1-hr PM2.5 (µg/m3)b Readings on 19 Jun 2015

View reading for:

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

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 7am to 7pm on 19 Jun 2015

Time 7am 8am 9am 10am 11am 12pm 1pm 2pm 3pm 4pm 5pm 6pm 7pm
3-hr PSI 36 39 46 49 52 53 53 53 53 53 53 52 51



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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