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Pollutant Concentrations

Readings on 01 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) 35(-) 19(8) 0.4(4) 11(45)
South 12(7) 19(19) 13(-) 17(7) 0.4(4) 9(36)
East 10(6) 15(15) 37(-) 27(11) 0.6(6) 9(39)
West 25(16) 23(23) 20(-) 29(12) 0.3(3) 12(51)
Central 8(5) 18(18) 60(-) 23(10) 0.4(4) 9(40)

1-hr PM2.5 (µg/m3)b Readings on 31 May 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 5 12 13 10 8 10 9 15 17 17 12 6
South 9 4 10 5 2 7 5 5 6 5 1 1
East 5 7 11 9 5 10 7 8 6 5 11 11
West 8 7 8 11 10 8 11 11 8 17 10 14
Central 7 7 7 7 4 9 7 7 5 6 12 5
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 12 13 16 12 16 11 12 7 5 4 7 13
South 6 10 9 10 21 19 10 7 13 22 8 12
East 8 8 11 9 10 14 4 10 7 16 15 17
West 20 21 24 18 16 15 16 14 10 7 5 7
Central 12 14 8 12 11 12 10 6 11 17 16 15

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 31 May 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 30 29 33 36 34 32 31 36 35 38 38 37
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 39 45 52 52 53 53 52 47 40 43 45 50



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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