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Pollutant Concentrations

Readings on 19 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) 34(34) 12(-) 9(4) 0.5(5) 19(59)
South 16(10) 32(32) 26(-) 44(19) 0.4(4) 21(61)
East 12(8) 23(23) 6(-) 47(20) 0.5(5) 15(55)
West 10(7) 39(39) 12(-) 59(25) 0.6(6) 24(64)
Central 14(9) 32(32) 33(-) 52(22) 0.4(4) 18(57)

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

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 16 - 10 13 23 21 18 25 9 15 26 40
South 9 - 20 15 18 6 8 10 4 8 13 15
East 11 - 16 12 17 11 10 13 11 7 20 16
West 11 - 23 19 16 15 5 11 12 24 18 35
Central 8 - 18 13 15 15 8 12 8 7 15 25
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 29 30 25 13 16 19 25 19 11 17 12 15
South 24 28 50 53 49 31 36 38 8 12 15 10
East 25 16 19 26 17 22 17 27 10 9 11 11
West 26 25 12 48 61 29 34 49 32 19 13 17
Central 28 21 25 34 37 18 31 36 18 9 6 8

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 Apr 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 49 - 53 54 56 54 53 51 46 50 52 59
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 64 66 66 69 74 73 71 70 67 61 52 51



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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