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Pollutant Concentrations

Readings on 03 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) 27(27) 46(-) 5(2) 0.6(6) 15(54)
South 16(10) 22(22) 6(-) 12(5) 0.7(7) 14(53)
East 13(8) 27(27) 28(-) 9(4) 0.9(9) 16(55)
West 4(2) 22(22) 45(-) 21(9) 0.6(6) 10(43)
Central 6(4) 22(22) 34(-) 4(2) 0.7(7) 13(52)

1-hr PM2.5 (µg/m3)b Readings on 02 Apr 2015

View reading for:

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

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 02 Apr 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 47 44 40 40 48 53 53 52 51 52 54 56
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 55 53 53 57 55 47 29 34 46 53 58 60



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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