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Pollutant Concentrations

Readings on 15 May 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) 23(23) 52(-) 15(6) 0.5(5) 13(52)
South 9(5) 16(16) 30(-) 19(8) 0.4(4) 9(36)
East 11(7) 15(15) 61(-) 15(6) 0.8(8) 10(42)
West 8(5) 27(27) 32(-) 24(10) 0.3(3) 15(54)
Central 7(5) 16(16) 52(-) 11(5) 0.6(6) 9(38)

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

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 8 8 15 14 11 16 22 9 13 9 8 12
South 7 9 5 4 4 5 8 7 9 8 9 6
East 5 7 5 10 10 7 7 7 7 9 10 12
West 20 22 18 20 16 12 17 23 24 23 19 9
Central 7 7 6 8 6 5 9 8 7 8 12 13
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 21 9 15 10 19 25 11 7 7 9 12 26
South 4 7 6 15 17 11 20 9 8 6 13 12
East 7 7 5 6 13 13 14 13 15 19 20 17
West 5 11 9 18 15 7 9 14 15 9 8 11
Central 11 6 9 7 17 16 12 6 5 10 13 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 14 May 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 37 39 41 44 42 41 42 45 48 47 48 46
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 44 39 37 39 51 53 54 51 46 42 47 52



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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