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Pollutant Concentrations

Readings on 27 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) 26(26) 39(-) 33(14) 0.5(5) 15(54)
South 10(6) 27(27) 6(-) 28(12) 0.4(4) 14(53)
East 8(5) 22(22) 10(-) 39(17) 0.7(7) 14(53)
West 49(31) 31(31) 30(-) 31(13) 0.4(4) 19(58)
Central 7(4) 25(25) 29(-) 33(14) 0.5(5) 12(51)

1-hr PM2.5 (µg/m3)b Readings on 26 Jun 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 10 8 11 10 9 8 14 16 19 14 25 16
South 6 12 8 9 4 15 14 11 10 13 30 17
East 9 8 8 12 13 8 12 10 15 15 17 22
West 12 7 9 19 9 17 18 20 17 16 27 29
Central 5 8 8 8 10 11 13 9 11 11 19 18
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 22 22 23 19 21 15 16 17 13 9 10 9
South 7 12 23 19 12 24 22 13 13 13 12 8
East 21 19 18 20 19 16 18 20 10 6 7 7
West 28 26 31 19 22 23 23 17 22 15 12 11
Central 15 24 25 21 16 14 11 16 8 5 4 3

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 26 Jun 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 43 38 36 40 41 45 49 52 53 53 57 59
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 61 60 61 62 61 59 58 57 55 52 44 36



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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