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Pollutant Concentrations

Readings on 19 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) 33(33) 12(-) 50(21) 0.4(4) 19(59)
South 12(8) 31(31) 3(-) 55(23) 0.5(5) 16(56)
East 10(6) 24(24) 7(-) 77(33) 0.6(6) 17(56)
West 14(9) 40(40) 23(-) 75(32) 0.5(5) 25(66)
Central 7(4) 27(27) 36(-) 75(32) 0.4(4) 16(56)

1-hr PM2.5 (µg/m3)b Readings on 18 Mar 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 13 18 17 13 11 19 15 17 14 8 14 18
South 9 10 7 11 7 11 5 15 15 13 16 22
East 13 8 11 14 9 13 12 11 12 8 16 21
West 19 13 10 14 16 18 13 26 21 21 20 23
Central 10 12 7 8 9 10 6 11 12 6 14 20
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 26 26 34 31 28 25 17 19 23 21 20 14
South 24 36 33 30 27 18 19 19 8 8 9 14
East 22 29 26 20 26 28 18 18 18 15 16 14
West 29 33 39 36 34 35 42 42 24 32 21 22
Central 23 21 27 30 24 28 22 20 13 18 20 14

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 18 Mar 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 54 52 49 48 46 51 49 53 53 53 53 55
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 61 66 70 71 71 69 67 65 62 60 57 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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