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Pollutant Concentrations

Readings on 27 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 4(3) 33(33) 30(-) 8(3) 0.4(4) 20(61)
South 13(8) 21(21) 15(-) 10(4) 0.5(5) 13(52)
East 10(7) 18(18) 28(-) 16(7) 0.7(7) 12(48)
West 28(17) 30(30) 42(-) 8(3) 0.4(4) 16(56)
Central 8(5) 21(21) 35(-) 13(6) 0.7(7) 12(51)

1-hr PM2.5 (µg/m3)b Readings on 26 May 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 15 16 22 19 35 33 31 39 40 31 23 13
South 9 11 6 8 3 3 8 6 8 23 22 12
East 10 6 9 6 8 6 10 7 9 12 11 15
West 10 14 11 14 14 8 13 23 28 33 17 19
Central 7 5 8 8 5 7 8 10 15 8 13 8
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 17 12 16 19 16 20 19 14 13 8 11 15
South 12 14 11 19 18 13 7 23 6 13 23 25
East 18 14 10 14 12 10 12 13 18 19 15 14
West 14 8 13 14 20 13 13 14 18 21 20 23
Central 12 11 12 11 19 11 21 9 11 24 27 23

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 26 May 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 46 44 44 45 48 48 51 54 57 59 59 57
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 54 52 52 52 54 55 54 53 53 54 56 58



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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