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Pollutant Concentrations

Readings on 21 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) 20(20) 37(-) 18(8) 0.4(4) 10(43)
South 6(4) 20(20) 7(-) 17(7) 0.4(4) 8(33)
East 13(8) 17(17) 20(-) 22(9) 0.7(7) 10(42)
West 59(37) 23(23) 36(-) 20(8) 0.3(3) 12(49)
Central 5(3) 18(18) 43(-) 20(8) 0.4(4) 8(32)

1-hr PM2.5 (µg/m3)b Readings on 20 Jun 2015

View reading for:

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

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 20 Jun 2015

Time 7am 8am 9am 10am 11am 12pm 1pm 2pm 3pm 4pm 5pm 6pm 7pm
3-hr PSI 33 36 33 34 34 36 40 38 40 40 44 48 49



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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