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Pollutant Concentrations

Readings on 27 Jan 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) 34(34) 32(-) 39(17) 0.4(4) 21(61)
South 7(4) 45(45) 18(-) 40(17) 0.4(4) 26(66)
East 6(4) 32(32) 13(-) 53(22) 0.7(7) 24(64)
West 3(2) 40(40) 25(-) 56(24) 0.5(5) 25(65)
Central 10(6) 39(39) 18(-) 52(22) 0.4(4) 22(62)

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

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 19 14 21 19 21 22 26 17 35 24 20 19
South 24 29 30 27 22 26 25 33 28 32 33 39
East 26 24 25 22 24 28 26 16 26 30 26 27
West 25 24 19 18 24 22 33 30 32 28 34 23
Central 27 32 31 22 20 25 28 16 23 19 25 22
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 21 24 17 23 38 22 19 16 18 13 15 17
South 39 42 26 31 35 18 18 15 7 8 13 14
East 28 25 22 23 30 16 26 22 17 18 21 17
West 32 28 27 27 24 21 23 22 17 21 25 16
Central 20 27 21 21 26 17 18 22 16 17 14 17

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 26 Jan 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 63 63 65 64 63 63 65 66 67 67 69 68
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 68 69 67 66 67 66 64 60 58 56 55 56



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.