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Pollutant Concentrations

Readings on 21 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 13(8) 34(34) 54(-) 8(3) 0.7(7) 22(62)
South 22(14) 26(26) 30(-) 21(9) 0.5(5) 16(56)
East 13(8) 26(26) 17(-) 34(14) 0.6(6) 19(58)
West 15(10) 41(41) 68(-) 33(14) 0.6(6) 23(63)
Central 16(10) 30(30) 78(-) 27(11) 0.5(5) 18(58)

1-hr PM2.5 (µg/m3)b Readings on 20 Apr 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 20 17 23 19 19 17 27 20 28 34 24 14
South 16 24 22 24 23 17 7 9 21 12 8 7
East 26 24 36 37 35 24 17 22 20 7 7 12
West 9 13 17 22 27 17 27 26 28 29 20 16
Central 20 23 23 17 17 15 20 20 23 12 18 15
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 28 12 8 21 24 17 19 37 33 24 24 26
South 8 7 7 7 8 28 30 23 25 27 18 16
East 6 8 6 14 11 23 12 24 24 19 16 18
West 22 10 9 10 12 15 33 37 32 30 38 44
Central 12 9 16 13 11 22 28 30 22 23 17 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 20 Apr 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 64 61 61 63 64 62 61 59 61 61 59 55
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 54 51 47 44 49 55 59 66 68 68 65 64



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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