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Pollutant Concentrations

Readings on 01 Apr 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 8(5) 31(31) 32(-) 5(2) 0.5(5) 16(56)
South 8(5) 26(26) 4(-) 14(6) 0.4(4) 15(54)
East 10(6) 22(22) 5(-) 20(9) 0.5(5) 15(54)
West 4(3) 31(31) 33(-) 12(5) 0.6(6) 17(57)
Central 5(3) 30(30) 62(-) 15(6) 0.4(4) 14(53)

1-hr PM2.5 (µg/m3)b Readings on 31 Mar 2015

View reading for:

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

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 31 Mar 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 51 51 52 54 56 55 55 56 57 56 57 56
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 57 58 56 55 51 52 54 54 54 53 54 55



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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