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Pollutant Concentrations

Readings on 10 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 9(6) 21(21) 31(-) 23(10) 0.3(3) 11(45)
South 12(8) 29(29) 3(-) 15(7) 0.4(4) 14(53)
East 5(3) 16(16) 8(-) 31(13) 0.4(4) 10(40)
West 6(4) 24(24) 11(-) 39(16) 0.4(4) 13(52)
Central 5(3) 22(22) 37(-) 25(11) 0.3(3) 10(43)

1-hr PM2.5 (µg/m3)b Readings on 09 Apr 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 14 15 10 12 9 6 8 14 12 23 13 7
South 13 10 13 7 7 5 4 10 15 14 22 22
East 8 7 5 7 10 8 6 12 7 11 11 13
West 16 15 16 13 15 12 13 20 21 23 17 9
Central 7 10 11 6 4 9 9 14 20 13 8 12
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 9 12 12 11 7 10 5 9 12 6 15 9
South 25 20 17 37 7 10 15 12 14 11 12 15
East 10 7 14 10 9 17 11 12 10 9 11 8
West 16 13 12 17 9 8 8 7 11 9 9 11
Central 7 9 11 14 11 15 7 8 7 9 18 10

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 09 Apr 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 44 45 48 44 41 36 35 42 51 55 55 54
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 52 52 52 54 52 52 42 43 41 41 45 45



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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