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Pollutant Concentrations

Readings on 08 Aug 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 6(4) 30(30) 54(-) 8(4) 0.6(6) 18(58)
South 15(9) 27(27) 55(-) 17(7) 0.5(5) 15(54)
East 12(7) 21(21) 19(-) 14(6) 0.4(4) 16(55)
West 29(18) 37(37) 47(-) 23(10) 0.4(4) 23(64)
Central 6(4) 24(24) 50(-) 13(6) 0.6(6) 14(54)

1-hr PM2.5 (µg/m3)b Readings on 07 Aug 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 19 23 20 16 25 21 19 24 24 17 12 19
South 5 13 11 15 11 16 13 11 18 8 15 26
East 13 12 15 14 9 14 15 16 14 20 22 20
West 30 30 16 20 24 21 22 26 26 31 30 30
Central 11 14 13 14 13 10 10 17 19 12 19 16
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 28 20 17 11 17 9 19 20 14 9 15 17
South 32 12 8 21 11 6 17 14 12 20 21 17
East 29 16 12 14 13 6 19 16 16 11 20 18
West 25 12 19 26 18 20 21 19 26 21 19 26
Central 22 12 8 17 16 6 20 12 14 11 20 18

Note:
a Sub-index for nitrogen dioxide is reported only when the 1-hour concentration exceeds 1130 µg/m3.
b There is no sub-index for 1-h PM2.5.

3-hr PSI Readings from 1am to 12am on 07 Aug 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 56 56 56 56 55 56 56 57 58 59 59 60
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 63 62 58 54 54 53 54 54 57 55 56 57



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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