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Pollutant Concentrations

Readings on 29 Mar 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 7(4) 27(27) 23(-) 26(11) 0.5(5) 13(52)
South 14(9) 31(31) 3(-) 23(10) 0.4(4) 19(59)
East 9(6) 23(23) 5(-) 35(15) 0.3(3) 13(52)
West 4(2) 30(30) 14(-) 31(13) 0.4(4) 13(53)
Central 5(3) 28(28) 3(-) 37(16) 0.3(3) 12(51)

1-hr PM2.5 (µg/m3)b Readings on 28 Mar 2015

View reading for:

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

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 28 Mar 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 45 44 48 51 53 53 54 54 55 56 55 54
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 54 53 52 48 49 52 53 55 55 56 56 54



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.