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Pollutant Concentrations

Readings on 21 Jan 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 10(6) 31(31) 26(-) 40(17) 0.4(4) 16(56)
South 15(9) 38(38) 7(-) 45(19) 0.4(4) 18(57)
East 6(4) 29(29) 8(-) 64(27) 0.5(5) 18(58)
West 3(2) 40(40) 11(-) 55(23) 0.5(5) 20(60)
Central 8(5) 36(36) 16(-) 58(24) 0.3(3) 15(54)

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

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 17 19 15 13 15 11 12 11 14 14 18 16
South 7 12 12 13 8 9 17 17 25 25 31 32
East 14 15 18 12 13 16 14 11 10 16 22 26
West 19 15 12 16 10 17 22 16 14 20 22 28
Central 12 10 11 15 10 15 15 19 22 10 12 17
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 16 16 15 15 19 21 20 20 16 19 18 21
South 34 26 25 21 24 20 12 12 10 7 16 7
East 22 19 21 21 30 21 23 24 16 21 21 16
West 22 30 23 14 22 30 24 26 22 20 26 21
Central 17 15 14 14 23 16 14 18 15 18 11 11

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 Jan 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 51 53 53 53 52 52 53 54 55 56 58 60
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 62 62 61 59 60 61 61 60 58 57 57 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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