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Pollutant Concentrations

Readings on 24 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 5(3) 32(32) 35(-) 13(6) 0.5(5) 17(57)
South 45(28) 33(33) 65(-) 9(4) 0.6(6) 22(62)
East 13(8) 29(29) 25(-) 23(10) 0.7(7) 22(62)
West 5(3) 24(24) 28(-) 22(9) 0.4(4) 12(49)
Central 18(11) 32(32) 65(-) 7(3) 0.9(9) 19(59)

1-hr PM2.5 (µg/m3)b Readings on 23 Apr 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 14 13 21 18 15 16 20 27 25 23 21 28
South 11 13 20 20 13 12 12 13 17 17 20 12
East 20 25 24 25 28 32 28 28 22 27 28 22
West 7 13 8 7 4 8 7 10 16 20 24 19
Central 13 17 19 16 15 14 13 16 21 22 21 14
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 10 11 11 14 19 22 16 10 6 5 21 29
South 19 20 21 19 24 27 32 33 35 52 42 30
East 14 13 12 19 20 17 22 20 18 15 21 26
West 20 19 14 12 16 9 7 6 10 6 11 11
Central 18 15 15 21 21 25 24 20 28 27 34 19

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 23 Apr 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 53 54 55 57 57 56 55 57 58 60 62 61
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 59 56 55 55 57 59 60 59 59 59 62 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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