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Pollutant Concentrations

Readings on 11 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) 30(-) 14(6) 0.5(5) 13(52)
South 36(23) 19(19) 7(-) 12(5) 0.3(3) 10(43)
East 16(10) 13(13) 15(-) 20(8) 0.9(9) 9(37)
West 25(16) 18(18) 33(-) 16(7) 0.3(3) 9(37)
Central 20(12) 17(17) 39(-) 15(6) 0.3(3) 10(40)

1-hr PM2.5 (µg/m3)b Readings on 10 Jun 2015

View reading for:

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

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 10 Jun 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 35 43 44 43 38 30 28 32 35 41 46 53
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 53 53 52 53 53 49 48 43 39 32 26 28



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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