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Pollutant Concentrations

Readings on 17 Mar 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 5(3) 27(27) 28(-) 16(7) 0.5(5) 15(54)
South 6(4) 30(30) 9(-) 16(7) 0.5(5) 15(54)
East 7(4) 23(23) 6(-) 44(19) 0.5(5) 15(55)
West 10(6) 32(32) 22(-) 39(17) 0.5(5) 19(59)
Central 6(4) 26(26) 30(-) 23(10) 0.5(5) 14(53)

1-hr PM2.5 (µg/m3)b Readings on 16 Mar 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 16 10 9 6 7 9 14 17 14 10 15 27
South 7 8 5 7 8 7 14 9 13 12 23 30
East 11 15 8 9 12 14 15 13 18 12 20 18
West 10 17 20 13 8 16 12 9 11 15 17 27
Central 12 6 9 6 14 15 12 8 7 11 12 16
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 26 33 20 25 13 5 10 15 24 16 10 13
South 30 32 33 24 25 9 8 22 11 9 6 7
East 24 19 26 27 17 17 16 17 13 9 10 12
West 27 26 30 24 38 43 29 11 15 23 13 10
Central 18 22 21 23 28 8 12 21 22 14 11 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 16 Mar 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 40 43 46 42 40 42 49 51 51 51 53 57
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 62 66 67 66 66 62 58 56 56 55 53 47



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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