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Pollutant Concentrations

Readings on 15 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(-) 30(13) 0.3(3) 12(48)
South 17(10) 21(21) 2(-) 39(17) 0.5(5) 12(48)
East 9(6) 18(18) 6(-) 45(19) 0.5(5) 11(47)
West 6(4) 25(25) 8(-) 43(18) 0.4(4) 13(53)
Central 6(4) 23(23) 35(-) 44(19) 0.3(3) 12(48)

1-hr PM2.5 (µg/m3)b Readings on 14 Apr 2015

View reading for:

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

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 14 Apr 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 53 53 52 52 51 50 52 53 55 54 54 53
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 51 45 51 52 52 44 38 37 36 35 38 41



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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