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Pollutant Concentrations

Readings on 24 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 4(3) 37(37) 9(-) 37(16) 0.2(2) 25(66)
South 6(4) 37(37) 6(-) 60(25) 0.5(5) 22(63)
East 8(5) 32(32) 4(-) 73(31) 0.5(5) 25(66)
West 12(7) 44(44) 11(-) 69(29) 0.5(5) 29(70)
Central 4(3) 35(35) 22(-) 66(28) 0.4(4) 24(65)

1-hr PM2.5 (µg/m3)b Readings on 23 Mar 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 22 22 27 25 19 22 28 25 22 25 24 22
South 20 27 30 27 26 17 16 25 21 19 24 28
East 23 24 28 23 23 27 22 30 21 25 27 24
West 25 29 35 27 27 28 26 30 42 37 30 29
Central 22 21 24 21 20 20 18 23 24 22 21 26
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 27 28 30 29 32 29 29 19 23 28 27 21
South 28 27 31 34 27 22 21 10 10 13 16 18
East 26 25 27 32 33 28 29 26 20 22 20 22
West 28 28 29 36 41 31 33 24 15 25 23 21
Central 27 28 30 35 31 23 26 23 25 24 25 23

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 23 Mar 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 60 63 66 67 66 64 63 64 65 67 66 66
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 67 68 69 71 73 72 70 65 62 60 61 62



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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