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Pollutant Concentrations

Readings on 01 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(2) 26(26) 21(-) 15(6) 0.6(6) 14(53)
South 21(13) 27(27) 14(-) 16(7) 0.5(5) 17(57)
East 12(8) 26(26) 23(-) 24(10) 0.5(5) 18(57)
West 4(3) 26(26) 42(-) 38(16) 0.6(6) 14(54)
Central 7(5) 26(26) 45(-) 13(5) 0.5(5) 16(56)

1-hr PM2.5 (µg/m3)b Readings on 30 Apr 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 9 21 25 21 18 15 17 11 16 13 14 14
South 17 16 23 21 15 15 12 10 12 17 22 21
East 7 19 34 28 24 19 14 14 16 12 18 22
West 18 16 6 12 13 11 8 11 12 11 15 7
Central 16 16 18 14 16 16 17 13 14 12 26 16
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 13 9 18 23 12 7 11 7 7 12 18 9
South 17 14 12 16 22 12 16 24 24 15 18 22
East 16 15 19 18 31 6 18 9 7 11 19 21
West 7 13 17 18 15 11 30 19 16 19 14 22
Central 5 18 20 18 20 11 21 17 12 16 19 17

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 30 Apr 2015

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



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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